Top Pick: The Puffy Lux Hybrid
Uses strong coils to resist sagging.
High density foams reduce the risk of dips and indentations.
Could last up to 10 years or more.
Medium-soft feel to suit most sleeping positions.
Lifetime warranty – covers indentations beyond 1.5″.
Get $300 OFF (time sensitive) – click the button below.
Buying a mattress isn’t exactly an enjoyable experience.
So the last thing that you want is a mattress that starts sagging or falling apart in a few short years or months – forcing you to go through the buying process once again.
That’s why I’ve come up with this list of the top 10 best mattresses that won’t sag to help you find a mattress that’s going to be comfortable and last you a long time.
But I’ve also gone in search of mattresses with the best warranties, sleep trials, and return policies so that if something does go wrong, you’ve got a high degree of buyer protection to minimise costs and inconvenience.
There’s also a buying guide in the second half of this article that walks you through the process of buying a sag-free mattress in more detail.
Alternatively: see the best priced mattresses to buy online in 2021 here.
10 Best Mattresses That Won’t Sag Reviewed
I’ve chosen the Puffy Lux Hybrid as the best mattress that won’t sag, sink, or dip prematurely.
The main reason is because it’s made from high quality materials that should last a long time and has specifications that make it suitable for a wide range of sleeping positions and styles.
I think most people will be happy with the Puffy Lux Hybrid.
But you may prefer some of the other options that I’ve provided below if you have more specific needs such as needing a mattress that’s better for heavier weights (over 230 lbs per sleeper), is double-sided, can help with back and hip pain, sleeps cool, is much cheaper, or if you live in Canada and don’t want to pay extra for shipping.
Click the red ‘view price’ button to check for discounts and to buy your chosen mattress directly from the manufacturer online (saves you money when compared to shopping in-store).
1: Puffy Lux Hybrid – Best Overall (Perfect for Side Sleepers)
I have chosen the hybrid version of the Puffy Lux as the best mattress to buy that won’t sag for several reasons.
With the main selling point being the hybrid design that gives it a bias towards naturally being more sag-resistant when compared to all-foam mattresses.
Because the individually wrapped, contour-adapt coils are less likely to break down over time when compared to a polyfoam base.
Whilst the memory foam and polyfoams found in the upper comfort layers are – according to independent tests – on the higher density end of the PCF spectrum; which favours durability and may help to limit the risk of sagging and body impressions when compared to lower density foams.
With these qualities, I would expect the Puffy Lux Hybrid to last longer than the average spring mattress, and I estimate that you could expect this type of hybrid mattress to potentially last for up to 6-10 years or more with the correct care.
But I’ve also picked the Puffy Lux Hybrid as the number 1 sag-resistant mattress because it has a medium to medium-soft feel with a fair degree of material compression that makes it a superb choice for side sleepers – which is the most popular sleeping position  and therefore gives the Puffy Lux Hybrid a very wide appeal.
However, front sleepers and back sleepers who prefer a mattress with a softer feel may still enjoy the Puffy Lux Hybrid, whilst the inclusion of the springs in the support core can help to support greater body weights in excess of 230 lbs to some extent.
Price wise, I feel the Puffy Lux Hybrid is well priced when compared to other types of mattresses that are known for high durability and a longer lifespan – such as all-latex mattresses.
However, there’s also the option to pay for your new Puffy Lux Hybrid mattress on finance to spread the payments out if you wish.
Click the button below to check the current price of the Puffy Lux Hybrid and get $300 OFF (time sensitive – ends soon).
- Side sleepers – the Puffy Lux Hybrid is ideal for side sleepers because the memory foam can adapt to your exact body shape to remove the pressure on your hips and shoulders whilst the coils provide adaptive support to maintain good posture.
- Front sleepers – the coils and the medium level of firmness should provide enough support to keep your hips aligned in the front sleeping position if you weigh up to 230 lbs.
- Back sleepers – if you sleep on your back then the coils should provide enough support whilst the foam can adjust to your exact body shape to cradle your spine and joints optimally.
- Combo sleepers – unless you are very heavy, you should find that the coils provide enough buoyancy to make switching positions fairly smooth if you’re a restless sleeper.
- Couples – if you sleep as a couple then the foam and the individually wrapped coils should do a good job of dampening movement to limit night time disturbances.
- Lighter weighted sleepers – if you’re under 150 lbs then the cushioning provided by the upper foam layers can allow you to sink more deeply into the materials so that the pressure is dissipated from your joints and into the mattress materials (unlike firmer mattresses that cause lighter weighted sleepers to rest ‘on’ the mattress and therefore experience more compression forces in their joints which can lead to discomfort).
- Controlling allergies – the hypoallergenic cover can help to block dust mite penetration to limit allergic reactions and lessen the chance of worsening asthma symptoms (dust mites can be an asthma trigger ).
- Heavier weighted sleepers – although the presence of the springs means that the mattress is likely able to support weights in excess of 230 lbs, just be aware that the deeper compression afforded by the foam means that you’ll probably sink more into this mattress than you might expect, which could be an issue if you’re a heavier weighted front sleeper over 230 lbs.
- Sleeping cool – the aerated coil support core and cooling foam means that the Puffy Lux Hybrid should sleep fairly cool, but if you’re a very hot sleeper or live in a hot climate then you might be better with a latex topped hybrid, or an all-latex mattress for maximum breathability.
- Lifetime warranty – covers sagging and indentations greater than 1.5″ that’s not through improper use.
- 101 night trial – gives you enough time to ensure that you’re comfortable and that the mattress doesn’t start sagging or indenting prematurely; full refund available if you have any issues.
- Fiberglass free – the Puffy Lux Hybrid is a fiberglass free mattress; which means that you don’t have to worry about this synthetic substance being released into your home and causing health issues and being very costly to remove (which can be a real problem with cheaper memory foam mattresses).
- Non-toxic foams – Puffy are registered as using CertiPUR-US® certified foams  which means that the Puffy Lux Hybrid is free from harmful chemicals like formaldehyde and toxic PBDE flame retardants.
- Discounts often available – Puffy often run discounts when you order your mattress directly from their site; there’s currently $300 OFF the Puffy Lux Hybrid at the time of writing – click the button below and get it before it’s gone.
2: DreamCloud Luxury Hybrid – Best Price + Warranty + Trial
A good warranty is essential when buying a mattress because it can protect you from premature sagging, body impressions, and indentations that could cause discomfort.
And the DreamCloud Luxury Hybrid comes with a lifetime warranty.
Crucially, in the first 10 years of the warranty, DreamCloud will replace your mattress with a brand new one if defects arise due to flaws that do not come from improper use.
After the 10 year mark, DreamCloud will either repair, recover, or replace your DreamCloud mattress.
All transportation charges (normally $50) will be waived if a defect or material failure is confirmed to exist.
The warranty covers visible indentations or sagging that exceeds 1.5″ – as long as the mattress is placed on a compatible base and has not been subject to improper care or misuse.
Overall, this is a good warranty when compared to the rest of the market because in addition to beating the 10 year industry standard, it also minimises costs for replacements.
Since other warranties may require you to pay up to 90% of the costs in the later years of a 20 – 25 year warranty.
And in addition to the lifetime warranty, you’re also covered by a 365 night trial – meaning that you can return the mattress after a minimum of 30 nights (to allow for adjustment) up to 1 year after purchase.
If you’re not happy, you can return the mattress free of charge and get a full refund or an exchange.
Beyond the industry leading warranty and excellent sleep trial, I’ve picked out the DreamCloud hybrid as one of the best anti-sag mattresses because not only is it very well priced and suited to a wide range of sleeping types via its ‘luxury firm’ level of firmness, the design and materials means that this mattress is built to last.
For example, the DreamCloud Luxury Hybrid uses mid and high density foams with a PCF range from 1.5 – 2.5 lbs in addition to individually wrapped coils for better durability (the foam densities were not easy to find, I had to contact support for confirmation – see the image below for proof via the chat transcript).
The DreamCloud Luxury Hybrid is 14 inches thick – which in conjunction with the high quality materials, collectively lends itself to better durability under greater body weights because there’s more material to provide support and cushioning.
I would expect the DreamCloud Luxury Hybrid to last at least 6-8 years or more with the correct care.
See below for more details on sleeping style suitability.
- Side sleepers – the pressure relief comfort layer works with the adaptive coil support system to provide a mixture of pressure relief and adaptive support that can remove the pressure from your hips and shoulders whilst also providing support for your spine.
- Back sleepers – the coil support core can help to maintain good posture in the back sleeping position.
- Front sleepers – even though the upper comfort layer is able to provide excellent pressure relief, the support coils and medium level of firmness can help to keep your hips properly aligned when sleeping on your stomach to guard against back pain.
- Restless sleepers – the medium firmness and support coils should provide the buoyancy and surface tension that you need to be able to switch positions smoothly without getting bogged down in the materials.
- Heavier weighted sleepers – the DreamCloud Luxury Hybrid doesn’t have a maximum weight limit (confirmed by customer support), which means that in conjunction with the robust coils, this mattress is suitably designed for sleepers over 230 lbs in all positions.
- Couples – the individually wrapped coils and foam layers combine to dampen movements very well so there’s less chance of you being disturbed by your partner moving around and getting up during the night.
- Pain relief – whilst I’m always wary of mattresses that claim to offer ‘pain relief’ (always check with your doctor before buying a sleep product for your health conditions), the pressure relieving qualities of the foam and the adaptive support of the coils does give this mattress potential to help ease musculoskeletal discomfort associated with conditions like arthritis and osteoarthritis, plus back pain and neck pain.
- Sleepers under 130 lbs – if you’re a very light sleeper, then you may find the DreamCloud Luxury Hybrid a touch on the firm side (especially in the side sleeping position) and you might prefer to upgrade to the DreamCloud Premier to benefit from the enhanced pressure relief and deeper capacity for compression afforded by the Eurotop and point-activated foam (click the button below and click the DreamCloud Premier UPGRADE button on the order page).
- Good edge support – the edges of the DreamCloud hybrid do not sag excessively under weight, which means that you can sleep close to the edge of the bed and not have to worry about roll-off.
- Sleeps cool – the coil core, gel foam, and breathable design means that heat is dissipated quickly and your temperature is well regulated if you’re a warmer sleeper.
- 0% APR – pay with Affirm and spread your payments out to increase affordability without having to pay any interest.
- $200 OFF (with free gifts) – there’s currently $200 off the DreamCloud Luxury Hybrid with a FREE mattress protector and luxury sheet set at the time of writing. Click the button below and get this deal before it expires.
3: Naturepedic Pillowtop Organic – Best For Heavy Sleepers
If you’re over 230 lbs then I recommend taking a look at the EOS Pillowtop Organic Mattress from Naturepedic.
Because this mattress is 15″ thick with 8″ of encased coils (with edge support) and 6″ of organic latex (plus a 1″ organic wool and cotton quilt) – which gives it greater capacity to accommodate heavier weights.
And whilst this mattress is available in ultra-plush, plush, and medium for maximum pressure relief, you can also order it in cushioned-firm or firm if you require more surface tension to help keep you ‘on top’ of the materials to guard against sinkage – whilst the pillowtop will still provide a high degree of softness and pressure relief even in the firmer options.
You can also choose to have different firmnesses on each half of the mattresses in the queen, king, or Cal. king sizes – which is ideal if you sleep as a couple with different sleeping preferences.
For example, if one person is a heavy weighted front sleeper they might be best suited to the firm setting, whilst a lighter weighted side sleeper might be better suited to a plush level of firmness.
The EOS Pillowtop Organic Mattress is also extremely unlikely to sag or indent prematurely because GOLS certified organic latex is one of the most durable materials that you can have in a mattress, whilst the high organic content and lack of cheap polyfoams and glues means that this mattress could last you for up to 8-12 years (or much longer) with the right care.
This is a more expensive mattress, but the high durability potential means that it could last TWICE as long as a cheaper foam mattresses that could start sagging in a few short years.
So if you’re on the heavier side and looking for a SOLID mattress that’s built to last then the EOS Pillowtop Organic Mattress could be a superb investment.
- Heavier weighted sleepers – the deeper 15″ profile, strong support coils, and durable organic latex makes this mattress perfect for supporting sleepers over 230 lbs whilst still providing pressure relief via the pillow top.
- Lighter weighted sleepers – if you’re a lighter weighted sleeper then the pillow top combined with a softer level of firmness can allow you to sink further into the materials to help dissipate pressure in your joints.
- Skinny sleepers – if you have a lower body fat percentage then the pillow top in conjunction with a softer firmness setting can help to soothe the pressure points that typically attract discomfort on traditional spring mattresses with a thin top layer.
- Side sleepers – the pillow top makes this mattress perfect for side sleepers because it can take away the pressure on your hips and shoulders whilst the latex and the coils work to keep your spine properly aligned and your joints supported. The plusher firmness options will likely suit you if you’re on the lighter side.
- Front sleepers – the firmer options will probably help to keep your hips in proper alignment if you weigh more than 230 lbs and you sleep on your front; especially considering that this mattress has a pillow top that naturally promotes deeper compression.
- Back sleepers – the medium and firmer options will likely suit heavier weighted back sleepers over 230 lbs.
- Restless sleepers – if you switch positions often during the night and you weigh more than 230 lbs, then going for a medium or firmer feel can help to up the surface tension to offset the softness of the pillow top somewhat so that you can switch positions more fluidly. You may even find that the pressure relief provided by the pillow top allows you to sleep more soundly if you’re currently tossing and turning on a worn out spring mattress with a thin top layer.
- Couples – the split firmness and great motion isolation provided by the individually wrapped coils makes the EOS Pillowtop Organic Mattress ideal for couples.
- Warmer sleepers – the highly breathable latex and spacious coil core can help to dissipate heat better than a memory foam or polyfoam mattress might for a cooler night’s sleep.
- Allergy sufferers – the organic latex and lack of synthetic materials makes this mattress better for your health and less likely to cause allergic reactions when compared to cheaper foam mattresses that may off-gas and allow dust mites to build up in the materials.
- High cost – there’s little denying that this is an expensive mattress. But it could be worth the cost when you factor in the longevity of this mattress (possibly in excess of 8-12 years) and its capacity to support heavier weights (which may otherwise cause a cheaper spring, memory foam, or polyfoam mattress to degrade at a faster rate).
- 90 night trial – return the mattress in the 30-90 night window for a refund; layer swaps are also available in the EOS range for free.
- 20 year warranty – the first 10 years are non-prorated which means that you get a new mattress or appropriate repairs at no extra cost, whilst the final 10 years have a graded prorated coverage. Coverage of body impressions starts at 1.5″.
- Toxin free – Naturepedic’s mattresses are some of the very few legitimate organic mattresses on the market that have been certified by GOLS (Global Organic Latex Standard), GOTS (Global Organic Textile Standard), GreenGuard Gold, and MADE SAFE® to ensure that the mattress is free from toxic chemicals and harmful substances that are often found in cheaper foam mattresses.
- Financing available – to spread the cost out, you can pay with Affirm.
- 10% OFF – there’s currently 10% off with the code SAVE10 at the time of writing. Click the button below and apply this code before it expires.
4: Idle Hybrid – Best Double Sided Mattress (Extra Durable)
The double-sided design of the Idle Hybrid means that it may be even more resistant to sagging and last you longer than a single sided mattress (most mattresses on the market today are single sided).
Because this flippable mattress is 14 inches thick to improve its capacity to handle more weight, whilst the natural latex and edge-to-edge pocket coils enhance durability.
And you’re also covered by a lifetime warranty and an 18 month sleep trial so that you’re well protected against defects, premature sagging, indents, and body impressions.
The Idle Hybrid comes in medium, luxury firm, or medium on one side and luxury firm on the other to suit a wide range of sleeping styles.
- Heavier weighted sleepers – the luxury firm option can handle more than 300 lbs per sleeper.
- Front and back sleepers – the medium and luxury firm options provide the surface tension that you need to help keep your hips properly supported when sleeping on your stomach or back.
- Side sleepers – the medium firmness and upper foam layers can help to provide pressure relief for average and heavier weighted side sleepers, whilst side sleepers under 150 lbs might prefer the deeper sinkage provided by the Idle Gel Plush model.
- Combo sleepers – the ‘Buoyancy Foam has 400% more support than regular memory foam’ so that you can move around in the mattress more easily.
- Lighter weighted sleepers – if you’re under 150 lbs then you might prefer the Idle Gel Plush because the material and softer firmness may allow you to sink more deeply into the materials so that you can get more pressure relief for better comfort.
- Buyer protection – the lifetime warranty and 18 month sleep trial give you a significant window of recourse if you don’t like the mattress or premature sagging or defects occur.
- Low off gassing potential – the CertiPUR-US® foams used in Idle’s mattresses means that there’s no toxic chemicals like formaldehyde, PBDE’s, mercury, or lead, and odor-causing VOCs are minimised to less than 0.5 parts per million to combat indoor emissions.
- 20% OFF – Idle are running a 20% off promotion on the Idle Hybrid at the time of writing. Click the button below and get this offer before it expires.
5: Level Sleep – Best For Back and Hip Pain (All-Foam)
If you’re looking for a durable all-foam mattress that may also be able to help with back pain then the patented TriSupport® in the Level Sleep Mattress could be ideal.
Because whilst I’m very wary of recommending mattresses that claim to have some kind of medical benefit (and you should always check with your doctor before buying a sleep product for your specific needs), the claims made by Level Sleep are supported by clinical trials.
Where 50% of participants apparently reported ‘…a greater than 50% reduction in both morning pain and stiffness’ (source).
With further endorsements from several chiropractors such as Dr. Robert Adams and Dr. Nick Athens.
This potential reduction of pain is possible because the Level Sleep mattress uses different densities of foam along the length of the bed so that the mattress is softer around your shoulders to reduce pressure, is firmer around your lower back to keep your spine neutrally aligned, and has a medium density of foam around the hip region to maintain good posture.
This zoned support system allows for a more personalised sleeping experience and could help you to wake up more refreshed when compared to a mattress with inferior support potential because by sleeping in good posture, your muscles aren’t working overtime during the night to try and keep your body in proper alignment.
As far as durability, resisting sagging, and lifespan goes, the higher density foams means that this mattress could have the potential to last up to 6-8 years or more with the right care.
Of specific note is the ‘preflexed’ foam which basically means that the foam used in the Level Sleep Mattress has the potential to indent LESS when compared to cheaper foam mattresses that are otherwise notorious for having body impressions appear prematurely.
If you’d like more information on how to buy a mattress for back pain then have a look at my list of the top mattresses and beds especially for combating back pain here.
- All sleeping positions – the distribution of soft, medium, and firm foams across the length of the mattress means that the Level Sleep mattress has the potential to suit front, back, side, and combination sleepers.
- Couples – the all-foam design can help to reduce motion transfer so that you and your partner don’t wake each other up as you move around.
- Doesn’t feel like regular memory foam – the polyfoam used in the Level Sleep mattress means that it doesn’t have the same deep hugging feeling that some other types of memory foam mattresses have. This means that whilst there’s still a nice amount of pressure relief and more responsiveness for better surface mobility, you might prefer something like a Tempur-Pedic mattress if you want much deeper pressure relief.
- Lifetime warranty – to protect you from premature sagging and indentations.
- 1 year trial – try the Level Sleep mattress for up to 365 nights to ensure that you’re comfortable.
- 0% APR – choose financing with Affirm at checkout to spread your payments without any extra interest (click the button below to learn more).
6: PlushBeds Luxury Bliss Hybrid – Best Cooling Mattress
If you’re looking for a mattress to help regulate your temperature that won’t fall apart like a cheap spring or foam mattress, then the Luxury Bliss Hybrid Latex Mattress from PlushBeds is an excellent option.
Because not only does the GOLS certified organic latex combine perfectly with the individually wrapped coils to allow for maximum breathability and cooling potential, the highly durable nature of these materials means that this mattress is highly unlikely to sag and could last you more than a decade with the right care.
This is also a fiberglass free mattress that uses organic wool for its fire barrier and has many certifications that proves that this mattress is free from harmful chemicals and toxins.
- Warmer sleepers – if you sleep hot or live in a warmer environment then the breathable latex and coils can help to dissipate heat and regulate your temperature superbly.
- Front and back sleepers – the medium and medium-firm options make this mattress ideal for front and back sleepers because the surface tension combined with the latex and coils can help to keep you in good posture.
- Side sleepers – the medium level of firmness should provide the right amount of pressure relief and support for side sleepers above 130 lbs.
- Restless sleepers – the coils and latex combine to provide a buoyant sleeping surface that makes switching positions much easier when compared to memory foam mattresses with a deeper contouring effect.
- Heavier weighted sleepers – the robust coils and durable nature of the organic latex means that this mattress can support heavier weighted sleepers over 230 lbs and shouldn’t sag prematurely like cheaper polyfoam mattresses tend to do under greater loads.
- Couples – the coils are designed to dampen movements for a more undisturbed sleep.
- Sensitive sleepers/allergies – the high amount of organic material and lack of toxic chemicals means that this mattress could be ideal for minimising reactions in sensitive individuals with asthma, hay fever, dust mite allergies, and eczema.
- Lighter weighted side sleepers – if you sleep on your side and weigh less than 130 lbs then you may find the Luxury Bliss a bit too firm and may enjoy the deeper compression and pressure relief afforded by PlushBed’s Natural Bliss model with the ‘soft’ firmness option.
- 100 night trial – more than 3 months to ensure that you’re happy with the mattress; free returns and a full refund available if required.
- 25 year warranty – covers impressions and sagging over 1.5 inches.
- Works with all adjustable bases – even though this mattress has springs, it’s designed to work with ‘all’ adjustable beds.
- Save $1,200 – at the time of writing, you can get $1,200 OFF the Luxury Bliss (saving you 60%) click the button below and get this amazing discount before it’s too late.
7: Aviya – Best Bouncy Spring Mattress For Combo Sleepers
If you’re just looking for a simple spring mattress that won’t sag then the Aviya spring mattress is a great option.
Because this mattress contains 850 (15 gauge) coils in the queen (1100 for the king) that sits beneath a high density polyfoam layer (1.8 PCF) that’s specifically designed to resist sagging.
The foams are certified by CertiPUR-US® to ensure that the mattress is free form toxic chemicals like formaldehyde, PBDE’s, and has minimal off-gassing potential.
Whilst the natural fibers (cotton, linseed, and flax) also help to contribute to better durability, and I could see the Aviya mattress potentially lasting up to 6-8 years or more with the right care.
The bounce and responsiveness of the springs makes the Aviya a great mattress if you’re a combination sleeper that needs to change positions smoothly without the drag that often comes with memory foam and very soft mattresses.
- All sleeping positions – you can order this mattress in plush/soft, luxury firm, and firm to accommodate front, back, side, and combination sleeping.
- Edge sleepers – if you like to hug the edge of the mattress as you sleep, then the 3″ of high density 80 ILD foam around the edge of the mattress can help to guard against sag and roll-off.
- Combination sleepers – the thinner top layer and spring core means that this mattress has excellent responsiveness and buoyancy to help you switch positions quickly and smoothly.
- Warmer sleepers – the thinner top layer and spring core allows air to flow freely through the mattress to dissipate heat effectively and help to regulate your temperature.
- Couples – spring mattresses have a bad reputation for being noisy and transferring movement very easily, but this shouldn’t be as much of an issue with the Aviya because the coils are individually wrapped to disperse vibrations and dampen movements.
- Limited pressure relief – if you’re a side sleeper, weigh less than 130 lbs, or have a low body fat percentage, then you may find that the Aviya doesn’t provide the same depth of pressure relief and sinkage that a memory foam, latex, or hybrid mattress can.
- 10 year warranty – non-prorated, meaning that you’ve got free repairs and replacements; and the body impression coverage begins at 1″ (beating the industry average of 1.5″).
- 100 night sleep trial – free pickup and full refunds available; minimum trial time is 14 days to allow for adjustments.
- $200 OFF – there’s currently a deal where you can get $200 off the Aviya mattress. Click the button below to see if this deal is still active for you.
8: Haven Lux Hybrid Chiropractic – Best Canadian Mattress
If you live in Canada then it can be quite frustrating to find that many of the top rated mattresses online often incur extra charges to ship outside the US.
However, Haven Sleep is a Canadian based mattress company that provides free shipping to all 10 Canadian provinces.
And I’ve picked out the Haven Lux Hybrid Chiropractic as the most durable and best mattress for Canadians not just because of the free shipping, but also because this 14″ mattress is built to last.
Since this mattress is made with latex and individually wrapped coils to guard against sagging and body impressions; whilst also providing breathability, pressure relief, and has the option of zoned support in the Classic Plush + Softer Zoned Support option.
The Haven Lux Hybrid is also approved by the Canadian Chiropractic Association (source), which means that this mattress may help to support your spine for a more restful sleep when compared to other mattresses.
- All sleeping positions – the Classic Plush version is the firmest option that should be well suited to front, back, and combination sleepers; whilst the Soft Zoned version will likely provide better pressure relief and cushioning for side sleepers and lighter weighted sleepers who need more material compression to dissipate the compression forces on their joints.
- Doesn’t feel like memory foam – this may or may not matter to you, but although this mattress offers great pressure relief in the Soft Zoned version, it doesn’t have the same deep sinking feeling that often comes with memory foam mattresses.
- Free shipping in Canada – hassle free when compared to other US-based companies.
- 100 night trial – more than 3 months to make sure that the mattress is right for you.
- 0% APR – spread the cost at no extra interest.
- Save $100 – at the time of writing, you can get $100 OFF the Haven Lux mattress. Click the button below and get it before it’s gone.
9: Avocado Vegan – Best Eco Friendly Mattress
By going for the Avocado Vegan Mattress, not only do you avoid animal products like wool, you’re also buying a mattress that’s made from very high quality materials that can help to guard against sagging and extend the lifespan of the mattress.
Because this mattress is made from GOLS certified organic latex, 100% USDA and GOTS certified organic cotton, and includes up to 1414 pocket support coils made from tempered steel for maximum durability – without the need for polyfoams, polyester, or toxic fire retardants.
- All sleeping positions – the standard vegan mattress comes in ‘gentle firm’ which should suit front, back, and side sleepers very well; whilst the addition of the optional pillow top can add more pressure relief and deeper compression for skinnier sleepers, lighter weighted sleepers, and anyone that wants to minimise pressure points.
- Vegans – certified by Vegan Action and is a PETA Approved product.
- Extra cost for pillow top – the optional pillow top feature costs more.
- Good buyer protection – 1 year sleep trial, 25 year warranty, free shipping and returns.
10: Nectar – Best Low Cost Foam Mattress
If you’re looking for an all-foam mattress that’s well priced but long-lasting, then the Nectar Memory Foam Mattress could be ideal for you.
Because this is one of the lowest cost mattresses on this list and is made with high density foam (2.2 PCF in the base layer) for better durability and a longer lifespan.
And there’s a 365 night trial and lifetime warranty to cover you against premature sagging, indentations, and comfort issues.
- All sleeping positions – whilst most people will find the Nectar to be a touch on the firmer side to help maintain good posture in the front and back sleeping positions, the memory foam can also help to relieve pressure in the side sleeping position too.
- Limited bounce – the all-foam design and memory foam feel means that this mattress lacks the bounce and buoyancy that some combination sleepers may need to switch positions smoothly; although the excellent pressure relief may actually help to give restless sleepers some relief.
- Try for all seasons – 1 year trial to ensure that you’re comfortable in both warmer and cooler temperatures.
- Safe – the foams used by Nectar are certified by CertiPUR-US® to ensure that they are safe and free from toxic chemicals like formaldehyde, whilst also keeping VOCs to below 0.5 parts per million to limit off-gassing and smells.
- Lifetime warranty – covers sagging and body impression greater than 1.5″.
- 0% APR – select Affirm at the checkout and spread your payments out for up to 2 years without any extra interest.
- $250 discount – at the time of writing, you can get $100 OFF the Nectar mattress and get 2 FREE pillows (worth $150) for a deal worth $250. Click the button below to get this offer now before it expires.
How to Buy a Mattress That Won’t Sag
A sagging mattress is one that has a noticeable dip in its surface – typically more towards the centre of a single-sleeper mattress and on both halves of a double-sleeper sized mattress (sometimes creating ‘valleys’ on each side and a ‘ridge’ in the middle).
Mattresses with significant sag have lost tension somewhere in the materials – usually in the lower support core – which is usually the result of material degradation through wear and tear over time.
For example, all-foam mattresses made from lower density polyfoam are especially susceptible to sagging because the foam typically struggles to return to its original shape after being compressed repeatedly in the same places night-after-night.
Whilst spring mattresses are also liable to experience sagging as the springs begin to lose their tension and the upper comfort layers begin to bow inwards.
Mattresses that sag more than 1.5 inches could cause back pain because your muscles, spine, and connective tissues are being held in bad posture for several hours.
Slight dips are often called ‘body impressions’ and whilst slight changes in the materials in the upper surface of the mattress that follow the natural curves of your body may actually help to increase comfort, excessive impressions or indentations can lead to pressure points and sensitive spots on your body.
Below is a table that describes the different types of material degradation that can affect mattresses.
|Material Degradation Type||Effect|
|Sagging||Pronounced dip greater than 1.5 inches in the surface of the mattress – typically where the mattress supports the most amount of weight around the hip and shoulder regions. Affects all types of mattresses.|
|Body impressions||Imprints in the surface of the mattress that come from the sleeper’s body shape. Can affect all mattress types but particularly those with low density foam in the top layers.|
|Indentation||Similar to body impressions, indentations are pronounced changes in the surface of the mattress. Can affect all mattresses but specifically those with low density foam in the top layers.|
|Dip||Localised sagging or body impression.|
|Valley||An elongated dip that reflects the entire length of a person’s body impression in the mattress. Valleys are common in double sleeper mattress sizes – with a valley appearing on each half of the mattress.|
|Ridge||The raised part of the mattress in between two valleys (usually down the centre of the mattress).|
|Softening||The softening of the materials through repeated use – most noticeable in mattresses that were on the firmer side after manufacturing. Can affect all mattress types but particularly those with low density foam in the top layers.|
|Defect||An imperfection in the mattress – usually in reference to a problem with the mattress that’s the fault of the manufacturer and covered under warranty.|
|Malfunctions||Problems with special features of a mattress or bed frame – typically in reference to mechanical issues such as an adjustable bed frame not moving.|
Together, the various types of material degradation can reduce the quality of your sleep through muscular discomfort, joint pain, and temperature increases due to impaired airflow as a result of the integrity of the materials being compromised.
Consequently, you may find it harder to get to sleep, wake frequently during the night, or even develop sleep apnea if the uneven surface causes your neck or shoulders to become positioned in a way so that your airways become narrowed (which stops you from breathing properly ).
If your mattress shows signs of sagging in excess of 1.5 inches then it’s possible that this change in the mattress integrity could adversely affect your sleep in the ways described above.
You can find out if your mattress is sagging by placing an object like a shower rail or piece of wood across the top of the mattress and moving it around to look for gaps – as demonstrated in the video below:
Durability vs Lifespan
The durability and the lifespan of a mattress are not quite the same thing, but the durability is a factor that can influence the lifespan – definitions are as follows:
- Durability – the durability of a mattress describes how well the materials and design of the mattress combine to create a bed that can resist sagging and other types of material degradation.
- Lifespan – the lifespan of a mattress refers to how long a mattress lasts before it needs replacing due to it becoming so uncomfortable or otherwise not fit for purpose any longer.
However, just because a mattress is made from durable materials doesn’t necessarily mean that it will have a long lifespan – since the quality of the materials, the design of the mattress, the frequency of use, the care, and the physical characteristics and sleeping style of the users of the mattresses are also variables that can influence the lifespan of the mattress.
All mattresses will sag to some extent given enough time.
The truth is that eventually, all mattresses are going to exhibit body impressions, dips, and sagging to some extent through extended use.
However, there’s a big difference between buying a cheap foam mattress that could start sagging significantly and causing sleep problems after a few short months, and a high quality mattress that could still be very comfortable and display only minor changes in the material integrity after several years.
And if you follow the 3 steps below, you’ll be better positioned to buy yourself a mattress that’s more durable, longer lasting, and less liable to sag excessively after a relatively short period of time.
1: Select a Durable Design and Materials
The lifespan of a mattress can be influenced by the design of the mattress and the durability of the materials used.
With the lower support core having a large impact on the mattress’ potential ability to resist sagging.
Whilst the integrity of the upper comfort layers also has some influence on resistance to sagging and surface degradation like body impressions and indentations.
Therefore, if you want to buy a mattress that lasts a long time and is less likely to sag, then you should typically look for all-latex, hybrid, and high density memory foam mattresses over cheap traditional spring mattresses and low density polyfoam (all-foam) mattresses.
However, you should also look for high quality materials within those designs to maximise durability.
Below is a brief description of each mattress design and the material qualities that you should look for to reduce the risk of the mattress sagging.
All-latex (natural): Very Good Option
All-latex mattresses are some of the most durable and sag resistant mattresses that you can buy – potentially lasting up to 6-12 years or more with the right care and correct material selection.
You should choose a latex mattress with a high natural latex content with as little synthetic latex as possible since natural latex tends to be more durable.
Furthermore, the Dunlop method of processing tends to produce a more durable material than the Talalay process.
Latex foam is still susceptible to softening and body impressions but this tends to be less so when compared to low density memory foam and polyfoams.
All-latex mattresses are some of the most expensive that you can buy – especially if they have the GOLS organic certification – but their greater durability and potentially longer lifespan can push the relative cost down and make the extra money worthwhile.
Hybrid: Good Option
Hybrid mattresses also have the capacity for very good durability and the potential to last up to 6-10 years or more in some cases.
Look for individually wrapped coils with a lower gauge and a high coil count (800-1000+ in a queen) in the support core and either natural latex or high density memory foam in the upper comfort layer over cheap polyfoam to limit the chance of body impressions and indentations.
High quality hybrids tend to be less liable to sag and can last longer than traditional innerspring mattresses – which can help to justify the relatively higher cost.
Memory Foam: Poor-Good Option
The durability of memory foam mattresses can vary quite considerably from poor to good.
This disparity is because the density and quality of the foam can vary widely – with many low cost memory foam mattresses only lasting a few years and developing indentations and body impressions in just a few months in some cases.
Whilst high quality memory foam mattresses could last up to 6-8 years or more with the proper care.
Memory foam mattresses that also have a poor quality polyfoam core are particularly at risk of sagging – especially when being used by sleepers over 230 lbs.
Similarly, low density memory foam in the upper comfort layer is liable to develop indents and body impressions faster than a higher density memory foam.
Look for memory foam that has a density of at least 3-5 PCF or higher when used in the upper comfort layers.
Strict memory foam typically isn’t used in the support core and is usually made from polyfoam in all-foam mattresses – in which case you should look for high density polyfoam with a rating of 1.5 – 1.7 PCF or more.
Traditional Spring: Fair-Good Option
The more traditional spring mattresses that use a Bonnell coil core and a thin upholstered top layer are generally considered to be less durable and potentially more likely to sag than a hybrid mattress that uses individually wrapped coils with a lower coil gauge.
However, traditional spring mattresses can still last a reasonable amount of time – possibly in the 6-8 year range – if they are made by a good brand.
All-polyfoam: Poor-Fair Option
All-foam mattresses made from polyfoam tend to have the worst durability and shortest lifespan of around 5-7 years – with some cheap polyfoam mattresses that contain lower density foams only lasting a few years.
And although memory foam is derived from polyfoam, it has other chemicals added to it that can improve the durability of the foam.
Polyfoam mattresses that contain foams with a density lower than 1.5 PCF are at risk of sagging, body impressions, and premature softening.
And whilst polyfoam mattresses are some of the cheapest that you can buy, the lower lifespan and greater propensity for discomfort may mean that buying a better quality memory foam mattress is worth the money.
|All-Latex||Hybrid||Mem. Foam||All-Polyfoam||Trad. Spring|
|Lifespan||6-12 years||6-10 years||5-8 years||5-7 years||6-8 years|
|Durability||Very good||Good||Poor – good||Poor – fair||Fair – good|
|Sagging risk||Low||Low – fair||Fair – high||Fair – v. high||Fair – high|
|Body impression risk||Low – fair||Low – fair||Fair – high||Fair – v. high||Low – fair|
|Softening risk||Low – fair||Low – fair||Fair – high||Fair – v. high||Low – fair|
|Relative cost||High||Fair – high||Low – high||Low – fair||Low – fair|
|Overall:||Very good||Good||Poor – good||Poor – fair||Fair – good|
In addition to having good centre support, a mattress that’s built to last should ideally have some kind of extra edge support to guard against sagging along the edge – particularly if you’re the kind of ‘edge sleeper’ that hugs the edge of the bed, or you spend any length of time sat on the perimeter of your mattress to do your makeup, watch TV, etc.
Having a good edge support can allow you to use the full area of the mattress without being forced into the middle of the mattress through fear of ‘roll-off’.
All-foam mattresses tend to be the most susceptible to excessive sinkage and sagging at the edge of the mattress – so look for mattresses that uses separate sections of higher density foam to reinforce the edges.
And look for hybrid mattresses with lower gauge springs along the perimeter of the bed for better edge support.
Although a thicker mattress alone is not a guarantee of better durability or increased sag resistance, when all other factors are equal, a deeper profile may help to guard against sagging – especially if you’re on the heavier side – because there’s more material that can offer support.
Generally speaking, a mattress that’s 10-12 inches thick is adequate for most sleepers, although you may prefer to go for a deeper profile if you’re over 230 lbs.
2: Get the Right Level of Firmness
The firmness of a mattress describes how ‘hard’ or ‘soft’ it feels when you lie down on it and is set by the manufacturer.
Firmness is considered a comfort preference – with softer mattresses typically favouring side sleepers due to the better pressure relief on the shoulders, and firmer mattresses being better for front sleepers because the greater surface tension may help to keep your hips in alignment and maintain better posture to guard against back pain.
The firmness is not the same as the support – the latter describes how well the mattress can help keep your spine naturally aligned and is mainly dictated by the quality of the materials and the design of the lower support core.
However, a firmer mattress may help to reduce the chance of sagging, body impressions, indentations, and material degradation – both in isolation and whilst working with the support core to some extent.
This may be especially true in the case of heavier weighted sleepers over 230 lbs because the greater surface tension can help to buffer the downward force and stop you from crashing into the support layers below.
But you shouldn’t automatically go for a firmer mattress simply because it may help to combat sagging.
Instead, you should base your choice of firmness on your dominant sleeping position, body weight, and body type.
This is not an exact science but the table below can help you to make a better decision.
|Soft||Side sleepers, lighter weighted sleepers under 150 lbs, skinny sleepers.|
|Medium||Side, front, back, combo sleepers in the 130 – 230 lbs range.|
|Firm||Front and back sleepers, sleepers over 230 lbs.|
3: Finalise Your Preferences
With the design, material type, and firmness selected, the final step is to select your secondary comfort preferences and take steps to protect your finances as follows:
- Couples – if you sleep as a couple then all-latex, all-foam, and hybrid mattresses with individually wrapped coils can help to dampen movement so that there’s less chance of you waking each other up as you move around when compared to traditional spring mattresses. Some mattresses also allow for ‘split firmnesses’ where each half of the mattress is a different firmness suited to each person’s comfort preferences.
- Temperature regulation – all-latex, hybrid, and regular spring mattresses tend to be the most cooling because the materials allow for better airflow. All-polyfoam and memory foam mattresses tend to be the worst choice if you’re a warmer sleeper, although some do come with cooling gels and aerated designs to help with heat dissipation.
- Allergies – if you have a dust mite allergy then natural latex mattresses tend to be the best choice because they may help to resist dust mite penetration, whilst an organic cotton cover can help with sensitive skin.
- Warranty – look for a warranty that covers sagging and body impressions starting in the 0.5 – 1.5 inch range, as well as physical flaws, manufacturing issues with the cover (broken zippers, loose seams, etc), and coils that protrude through the surface. Look for non-prorated (over prorated) warranties that last at least 10 years so that you don’t have to pay for a replacements, but check the fine print to see if you will have to pay for shipping, upgrade, and inspection costs.
- Sleep trial – look for a sleep trial that lasts well beyond the 30 night mark so that you’ve got enough time to adjust to the mattress; although many trials will force you to keep the mattress for 30 nights before being able to return it – check the fine print to find out the minimum night duration.
- Financing – look for 0% APR financing deals to help spread the cost of your new mattress without having to pay more.
- Where to buy – mattress retailers are expensive because they need to cover their costs, so shopping online where the middle men are removed can save you a lot of money (up to 50% or more when ordering directly from the manufacturer in some cases with discounts applied). Cover yourself with a good sleep trial so that you’ve got plenty of time to make sure that the mattress is comfortable and isn’t sagging early on.
Here are the answers to some of the most common questions regarding mattresses and sagging.
What Causes a Mattress to Sag?
Mattress sagging can be caused by one or more factors that combine, such as: poor mattress design, inferior quality materials, low foam density, insufficient edge support, exposure to heavier body weights, exposure to sustained pressure in one area, natural wear and tear, and time.
Do All Foam Mattresses Sag?
Not all foam mattresses sag at the same rate. Lower density polyfoams (<1.5 PCF) and memory foam (<3 PCF) is typically more likely to sag or indent than more durable natural latex and higher density memory foams (>4 PCF).
What’s the Best Sag Resistant Mattress?
The best sag resistant mattress on this list in my view is the Puffy Lux Hybrid due to its durable design and wide appeal.
Click the button below to check the price of the Puffy Lux Hybrid and get $300 OFF (offer is time sensitive).
Sources and References
 OnHealth – Sleep: What Are the Best Sleeping Positions. Accessed 25/7/20.
 Asthma.org.uk – Dust Mites. Accessed 25/7/20.
 CertiPUR-US® – Companies Selling Products Containing Certified Foam. Accessed 25/7/20.
 NHS – Sleep Apnoea. Accessed 25/7/20.
Image Attribution and Licencing
All images supplied by their respective vendors and used with permission under the terms of a private affiliate agreement.
Dan is the founder and head content creator at Bedroom Style Reviews.
He has been working as a professional online product reviewer since 2015 and was inspired to start this website when he ended up sleeping on a memory foam mattress that was too soft and gave him backache.
Through in-depth research and analysis, Dan’s goal with this website is to help others avoid such pitfalls by creating the best online resource for helping you find your ideal mattress, bedding, and bedroom furniture.
Dan is a qualified NVQ Level 2 Fitness Instructor with 6 years’ experience helping clients improve their health through diet, exercise, and proper sleep hygiene.
He also holds several college and university-level qualifications in health sciences, psychology, mathematics, art, and digital media creation – which helps him to publish well researched and informative product reviews as well as articles on sleep, health, wellbeing, and home decor.
Dan also has direct personal experience with insomnia, anxiety, misophonia (hypersensitivity to sounds), and pain from both acute and long-standing sporting injuries – he enjoys writing insightful articles around these subjects to help fellow sufferers of such conditions.
Learn more about Dan here.