Have you ever hopped onto a friend’s bed and noticed that it feels completely different from yours? When you settle into your own bed at night it feels familiar. Someone else’s bed, even if it’s the same style of mattress, feels foreign – maybe even uncomfortable.
Over time, it’s common for a mattress to develop indentations known as body impressions. If you tend to sleep in the same part of the mattress every night, it’s bound to happen. A small degree of indentation is actually good – it helps support proper spine alignment and ensures optimal pressure relief. When the middle of the bed starts to dip, however, that’s a different problem.
Mattress sag is not good for your body or for the quality of your sleep. A sagging mattress doesn’t provide the support you need, and it could even make pressure points worse. Old and inexpensive mattresses are the most prone to sag, so ask yourself if it might be time for an upgrade.
In this article, we’ll explore the difference between body impressions versus sag and talk about how to prevent mattress sagging. We’ll discuss the benefits of upgrading to a new mattress and you’ll see our picks for the best mattress that won’t sag.
|Our 2021 Picks: Overall Best Mattresses that Won't Sag|
|Dreamcloud||Best Overall||VIEW LATEST PRICE →|
|WinkBed||Most Popular||VIEW LATEST PRICE →|
|Nectar||Budget Friendly||VIEW LATEST PRICE →|
|PlushBed||VIEW LATEST PRICE →|
|Puffy||VIEW LATEST PRICE →|
|Zenhaven||VIEW LATEST PRICE →|
|Loom & leaf||VIEW LATEST PRICE →|
|Saatva HD||VIEW LATEST PRICE →|
|Nolah||VIEW LATEST PRICE →|
|IdlePlush||VIEW LATEST PRICE →|
|Saatva HD||VIEW LATEST PRICE →|
|Birch By Helix||VIEW LATEST PRICE →|
|Helix Midnight Luxe||VIEW LATEST PRICE →|
Why Do Mattresses Sag?
It’s completely natural for your mattress to change a little bit over time – cushioning materials simply become softer with prolonged use. Even innerspring mattresses can develop sag as tension in the coils decreases. You’re most likely to notice sag in the areas that support the majority of your body weight – the hips, midsection, and chest or shoulders. You may also notice sagging in the center of your mattress if you sleep with a partner and share the middle of the bed.
Though a little big of sag is to be expected and can even be beneficial (especially for side sleepers), too much sag can negatively affect spinal alignment.
Here are the top three reasons mattresses start to sag:
- Low-quality material
- Poor foundation
- Liquid damage
The type and quality of material used in construction plays a significant role in determining durability and longevity. When a manufacturer uses lower-quality materials to reduce cost and maximize profit, the resulting product may not last as long. Certain materials simply aren’t designed to handle the weight and wear of two bodies sleeping on the mattress every night.
Though the quality of the materials matters, those materials need support to ensure optimal function. A poorly designed frame or improper foundation could contribute to premature mattress sagging. In fact, many mattress companies require buyers to use a specific foundation to validate the mattress warranty. If the mattress isn’t properly supported, the manufacturer won’t cover the cost to repair or replace it.
The third most common cause of mattress sag is damage from liquid. Many mattresses are now made with water-resistant covers, but liquid can still seep through and damage the mattress. Unfortunately, once liquid penetrates the cover it can be difficult to extract. A waterproof mattress cover is an excellent investment, especially considering any sign of soil or stain may invalidate your warranty as well.
Understanding Modern Mattress Materials
For many years, mattresses were constructed simply on a coil base with a padded top. Today, however, mattresses are made from a wide variety of materials and, in some cases, a combination of several materials. Before you start shopping for a new mattress, it’s important to know what your options are and to consider how resistant different materials are to sagging and body impressions.
Here’s an overview of modern mattress materials:
- Innerspring – The classic style you may be used to, innerspring mattresses were traditionally made with a single continuous coil. They are generally said to last 10 years, but the spring may start to lose tension after 5 to 6 years at which point you won’t be able to fix the resulting sag.
- Pocket Coils – Instead of a single continuous coil, some mattresses utilize a system of individual fabric-encased coils. These mattresses are very supportive but may be more resistant to sag because the coils respond to motion independently. If you don’t rotate the mattress or you tend to sleep in the same area all the time, however, you’ll still lose some tension eventually.
- Foam – Memory foam and polyfoam offers excellent pressure relief because it conforms to the shape of your body. The trouble is the material may stop regaining its shape completely over time if you sleep in the same area each night. Softer foams tend to sag within 5 years.
- Latex – This material is a little more durable than memory foam and it doesn’t tend to sink quite as much. You may notice some sag around the 5-year mark, but probably not to the same degree as memory foam or polyfoam.
- Hybrid – A hybrid mattress is one that combines two or more materials. In many cases, these mattresses are made with a coil base and a foam or latex topper. The thicker the comfort layer on a hybrid mattress, the longer it will last before sagging.
When properly constructed and supported, mattresses made from any of the materials listed above should last for several years without sagging. You do, however, need to perform some maintenance on your mattress to make sure it lasts as long as possible and provides the support you need.
How to Prevent Mattress Sagging
Even a high-quality mattress is prone to sagging with time, but there are certain things you can do to stave it off. You may not think of your mattress as a thing you need to maintain, but it’s a good idea to take a few simple steps to ensure that the mattress wears evenly.
Here are some tips to keep your mattress from sagging:
- Make sure your mattress is properly supported. Though some manufaturers claim their mattresses can be used on the floor, you’ll get more time out of a mattress on a proper foundation such as a box spring.
- If you’re using a slatted bed frame, look for slats that are spaced less than 3 inches apart to ensure proper support. You can also top the slats with plywood if needed.
- Use a thick mattress topper if your mattress starts to develop impressions and you want to extend its life by a few years.
- Once the indentation in your mattress exceeds 1 inch, there is little left to be done – you’re better off replacing it than trying to reverse the sag.
- Try change where you sleep on the bed to keep it from developing an impression right away – if you share with a partner, switch sides on a weekly basis.
- Rotate your mattress every 3 to 6 months so the head and the foot swap positions – if your mattress is two-sided, flip it every six months as well.
The Best Mattress That Won’t Sag
When it comes to choosing a new mattress, there are a variety of factors to consider. In addition to considering how much a material is prone to sagging, you should also think about how it affects support and pressure relief. Think about your preferences for firmness level as well, taking into account your typical sleeping style as well as your body weight.
There are many different mattresses out there, so it can be difficult to choose the right one. We’ve assembled a collection of durable mattresses made from high-quality materials that are resistant to sagging with proper care and maintenance.
Here are our top picks for the best mattresses that won’t sag:
Best Overall: The secret to creating a mattress that doesn’t sag is using high-quality materials. Amerisleep is one of the top online mattress companies, and for good reason. Not only do they offer a variety of models to choose from, but they are all made with plant-based Bio-Pur materials which deliver targeted pressure relief but resist sagging and body impressions. Our top pick overall is the AS3, Amerisleep’s most popular model rated medium firm.
The AS3 is a multi-layer foam mattress that combines the durable support of high-density foam with the pressure relief and breathable comfort of open-cell and low-density foam. This mattress utilizes a targeted pressure relief system to ensure proper spine alignment, but it bounces back quickly so you never feel stuck in the mattress. The AS3 is crafted for lasting comfort, so it is made with durability in mind and backed by a 20-year warranty. Plus, you can try it for a full 100 nights with free returns.
- Pros: Five models to choose from, plant-based Bio-Pur materials, targeted pressure relief system
- Cons: Could be stronger in edge support, may not have enough bounce for some sleepers
Best Budget-Friendly: You can’t put a price on a good night’s sleep, but that doesn’t mean you need to pay a fortune for a new mattress. If you’re looking for a mattress that offers good durability and support but you’re not willing to empty your bank account, consider Nectar. The Nectar mattress is made from premium foam, layered to give you the feeling that you’re sleeping on a cloud. This mattress ensures you wake up feeling rested, no matter your sleeping style.
The Nectar foam mattress starts with a quilted memory foam mattress cover to create a soft and airy top. Next comes a layer of gel memory foam to distribute your weight as well as your body heat, followed by a layer of Hi-Core adaptive memory foam for support. It’s all built on a stabilizing base layer and wrapped in a cooling Tencel cover. The Nectar mattress is affordably price and it ships free. Plus, you’ll get to try it for a full year before truly making up your mind.
- Pros: Long 365-night trial period, multi-layer foam construction, comfort and support
- Cons: May not be firm enough for heavy sleepers, foam may be slow to respond
Best Luxury: Choosing a new mattress can be tough enough, but then you have to actually get it into your house and set it up. If you’re willing to pay a little more for convenience and luxury, we recommend the Zenhaven mattress by Saatva. This premium mattress is made with natural and organic materials and it comes with free White Glove Delivery and setup. There’s no hassle for you at all!
The Zenhaven mattress by Saatva is crafted from natural Talalay latex and organic cotton to deliver the most comfortable and supportive night of sleep you’ve ever had. Latex is a more durable material than memory foam and it responds a little more quickly as well. The Zenhaven is unique in that it is a two-sided mattress – choose between a Luxury Plush or Gentle Firm feel simply by flipping it over. This mattress features a 5-zone comfort layer that delivers firmer support in the lumbar area and has a quilted organic cotton cover for breathable comfort.
- Pros: Made from natural and organic materials, flippable design with 2 firmness levels, no off-gassing
- Cons: Significantly more expensive than many models, neither side may be ideal for side sleepers
Best Memory Foam: Though memory foam tends to sag more than other materials, quality foams can last 5 years or more when you maintain the mattress properly. If you like the feel of memory foam and you’re concerned with pressure relief, we recommend the Loom & Leaf mattress by Saatva. The Loom & Leaf mattress is designed with multiple layers of premium foam and a quilted organic cotton cover and it is surprisingly affordable for the quality it delivers.
The Loom & Leaf mattress is built on a base made up of several layers of support foam to ensure the optimal degree of comfort and contouring support for your body and spine. This unique combination of layers helps relieve pressure while keeping you comfortable. Because the materials are of high quality, you can rest assured that this mattress won’t sag, and it comes in two different firmness levels according to your preference: Relaxed Firm or Firm. You’ll also enjoy free in-home delivery and setup, as you would with any Saatva mattress.
- Pros: Made with premium materials, two firmness levels to choose from, designed for adjustable bases
- Cons: Fairly expensive compared to many models, may be too firm for some users
Best Latex: Latex is a natural material that relieves pressure without the same degree of sink as memory foam. It sleeps a little cooler as well, and it is often a little more durable. Our top pick for the best latex mattress to prevent sagging is the PlushBeds Botanical Bliss. Though the Botanical Bliss mattress from PlushBeds costs a pretty penny, you’ll have a difficult time finding a mattress that delivers better quality.
This mattress is made with multiple layers of organic Dunlop latex, organic New Zealand wool, and organic cotton. This combination of materials makes it both antimicrobial and dust mite-resistant. Plus, it comes in three different heights and two levels of firmness: Medium and Medium-Firm. The Botanical Bliss mattress comes with a 100-night trial as well as a 25-year warranty to guarantee against sagging and other physical defects.
- Pros: Made from natural/organic materials, absorbs pressure, provides support, three firmness levels
- Cons: Significantly more expensive than other models
Best Innerspring: Innerspring mattresses typically last longer than foam mattresses and they aren’t as prone to sagging. The trouble with spring mattresses, however, is that the traditional continuous coil design transfers motion and the coil can lose tension over time. We love the Saatva Classic because it has a unique design and is made from quality materials. This mattress is not your typical innerspring. Instead of a continuous coil, it features individually pocketed coils that respond independently to motion.
The Saatva Classic mattress features a luxurious Euro pillow top with a pocket coil base and spinal zone technology to deliver the support you need and excellent protection against sagging. With the Saatva Classic, you can choose between three levels of firmness and two heights to customize your sleep experience. This mattress is designed to reduce back and joint pain while providing optimal spinal support for every sleeping style. Plus, you’ll enjoy Saatva’s customary free white glove delivery with setup and a 120-night sleep trial.
- Pros: Three firmness levels to choose from, luxury hybrid construction, breathable and supportive
- Cons: Hybrid mattresses tend to be fairly heavy, less contouring/hugging than foam mattresses
Best Dual-Sided: Rotating your mattress every 3 to 6 months can help it wear more evenly but flipping your mattress can extend its life even more. Not many mattresses are designed to be used on both sides, however. The Nolah Signature mattress is a flippable mattress that, in addition to offering extended durability, gives you two levels of firmness to choose from. Flip this 12-inch mattress from side to side to choose between Medium-Soft and Medium-Firm.
The Nolah Signature mattress features a luxurious organic cotton cover that wicks away moisture to keep you cool all night long. Inside you’ll find a high-density base layer for support as well as an additional support layer of high-resilience foam. On either side there’s a layer of cooling AirFoam in two thicknesses to determine the firmness. The Nolah Signature mattress works on all types of foundations and it comes with a 120-night trial period.
- Pros: Two-sided design to choose firmness, cooling foam for comfort, 120-night trial period
- Cons: May not be a good choice for heavyweight sleepers, somewhat pricier than other options
Best Hybrid: Why choose between mattress materials when you can combine the benefits of several? Hybrid mattresses are great to prevent sagging because you get the additional support of coils without sacrificing the comfort and pressure relief of memory foam. Our top pick for the best hybrid mattress to prevent sagging is the DreamCloud for its durability, quality, and comfort. This mattress is topped with a luxurious cashmere blend cover over a quilted Euro top for breathability.
In addition to being designed for durability, the DreamCloud mattress offers excellent comfort as well. This mattress is crafted with several layers of high-density memory foam set over a pocketed 5-zone innerspring coil system for targeted support. It offers the ideal combination of contouring comfort and pushback support that adapts to your sleeping style and allows you to change positions throughout the night. This mattress is rated Luxury Firm, around 6.5 on a 10-point firmness scale, and it comes with a generous 365-night trial so you can test it for a full year risk-free.
- Pros: Memory foam and encased coils, comfort and support, luxury materials and design
- Cons: Hybrid mattresses tend to be fairly heavy
Best for Cooling: If you tend to sleep hot, you may be worried about trying a memory foam mattress. Memory foam is known for its conforming properties, sinking around your body just enough to relieve pressure without compromising on support. The trouble is that this can trap body heat. If you’re looking for a mattress that keeps you cool and you want the feel of memory foam, we recommend the Idle Sleep Plush Gel mattress made with natural cotton fiber and gel-infused foam.
The Idle Sleep Plush Gel mattress features multiple layers of premium materials to provide comfort and support while resisting sag. This mattress is built on an 8-inch base of high-density foam topped with 3 layers of Idle memory foam. Over that you’ll find a 2-inch layer of gel-infused Buoyancy foam which reacts faster than traditional memory foam and sleeps cooler as well. This mattress is topped with an additional layer of cooling foam and a natural fiber cover for extra breathability. All Ide Sleep mattresses come with a generous 18-month in-home trial so you can make sure it’s the perfect mattress for you.
- Pros: Sleeps cooler than traditional memory foam, excellent pressure relief, conforms to body contours
- Cons: Could be stronger in edge support, not flippable like other Idle Sleep models
Best for Pressure Relief: Pressure relief is a common concern among side sleepers, though it can really benefit anyone. When your mattress doesn’t conform to the contours of your body, it creates pressure points which can lead to stiffness and soreness. Memory foam is great for pressure relief and our top pick is the Puffy Lux. Like all Puffy mattresses, this model comes with free shipping, a lifetime warranty against sagging, and a 101-night sleep trial. If you don’t love it, return it for a full refund.
The Puffy Lux mattress features a multi-layer foam construction using proprietary Puffy materials that relieve pressure and wick away body heat. You’ll enjoy the perfect combination of contouring and balanced support with the added comfort of a high-density transition layer. Puffy’s materials are designed to support temperature regulation and this model is rated Medium Plush, between 5 and 7 on a 10-point firmness scale. Plus, it is upgraded from the original Puffy with a luxury fabric cover.
- Pros: Designed for cooling comfort and support, climate-adaptive materials, strong pressure relief
- Cons: Significantly more expensive than many models, may not be firm enough for stomach sleepers
Best for Heavy Sleepers: Sleepers who are a little on the heavier side often have trouble finding a mattress that is supportive enough for their weight. The average mattress is already prone to sagging and sinking, but the risk increases if you weigh more than 230 pounds. If you’re looking for a durable mattress specifically designed for heavy sleepers, we recommend the WinkBeds Plus mattress. Uniquely designed for sleepers over 300 pounds, this mattress is exactly what you need.
The WinkBeds Plus mattress delivers the comfort of foam with the support of coils. It features luxury hybrid design, made with multiple support zones in an individually wrapped coil base toped with a gel-infused Euro-pillow top. This mattress also utilizes the Extra-Edge Support System to prevent sagging and the Tencel cover helps wick away body heat. Plus, with SleepCalm Motion Isolation Technology, you’ll enjoy a restful night of sleep even if you share your bed with a partner. Try it for a full 120 nights in your own home to decide if it’s the perfect fit.
- Pros: Uniquely designed for individuals over 300 pounds, 7-zone support layer, maximum heat transfer
- Cons: May not sink as much as traditional foam mattresses, some find it too firm
Shopping for mattresses can be tough simply because there are so many different options to choose from. If you’re looking for a mattress that will be worth the investment, you’ll enjoy any of the models we’ve reviewed above. They’re designed with quality materials to resist sagging.
We’ve done our best to compile a list of a variety of choices in different categories to help you select the best fit for your needs. Check them out and let us know what you like!
Frequently Asked Questions
- Why is my mattress sagging on one side? – The most common reason a mattress sags on one side more than the other is from the degree of wear and tear. If you don’t share your bed with a partner but tend to sleep on one side, you’re more likely to notice sagging on that side. If you do share your bed with a partner, the bed may sag a big more on the side of whoever is heavier. Certain mattresses offer stronger edge support than others to help prevent sagging on the sides, but poor-quality materials and age will still be a factor.
- How long should a mattress last before sagging? – The average lifespan of a mattress is about 7 years, though durability depends on quality and construction. Even high-quality mattresses will eventually start to sag or form an indentation, so it’s important to rotate the mattress every few months to help it wear more evenly.
- Do mattress warranties cover sag? – A mattress warranty typically covers physical defects in the mattress, including sag. The key is that the mattress must display a certain degree of sag when no one is on it – most manufacturers require at least 1.5 inches. The warranty won’t cover comfort issues and if you don’t keep the mattress on a supportive foundation, the warranty may be void.
- Can you fix a sagging mattress? – You may be able to temporarily fix problems with sag, but once the materials have become compressed you won’t likely be able to reverse the effects. Using a mattress topper may help reduce the feeling of sag, or you can try placing pillows under the mattress – place one under each indentation and adjust as needed. Placing plywood under the mattress may help or, for a more permanent solution, try replacing the foundation. At a certain point, however, you’ll need to replace the mattress.
- How do I file a warranty claim for mattress sag? – Your best bet is to contact the manufacturer of your mattress. Before you call, check the information you received with the mattress or visit the website for warranty information. Some manufacturers have separate department that handles warranty claims.