Top 10 mattresses for 2020
By Ben Slater
We reveal our pick of the best mattresses available to buy, based on the results of our impartial rigorous lab tests.
With the quality of your sleep and the support of your spine at stake, do you really want to risk spending a fortune on an unsupportive mattress that won't stand the test of time?
Well, fortunately you don't have to. Our independent and rigorous lab tests have uncovered the best mattresses – and exposed the worst. With more than £1,000 separating our cheapest Best Buy mattress from our most expensive Don't Buy, a good night's sleep might cost less than you expect.
Whether you’re looking for a pocket sprung or memory foam mattress, you'll want to take a look at our recommendations below. We’ve picked out the highest- and lowest-scoring mattresses that are available to buy in 2018, so you can be sure of buying the best and avoiding the worst.
Only logged-in Which? members can view our recommendations in the table below. If you're not yet a member, join Which? to get instant access.
Top 10 mattresses to buy
All 10 of the mattresses below performed well in our tough body-support and durability tests. But you should always try out the mattress in a shop if you can, because that’s the only way to know whether you will personally find it comfortable
As far as we’re concerned, this pocket sprung and memory foam hybrid is the best mattress money can buy right now. It provides good support whatever position you sleep in; it’s excellent at preventing the transfer of movement from one side of the bed to the other; and you can sleep safe in the knowledge that it will stand the test of time without sagging, softening or becoming less supportive.
This mattress is a trendy, bed-in-a-box that’s only available online.
But don’t let that put you off - there’s a 100-night trial period, during
which you can send it back for a full refund if you don’t find it
comfortable. If you do like the feel of it, though, you can sleep safe in
the knowledge that you’ve bought an exceptional mattress. It's supportive,
won’t sag or soften with time and, unlike some foam mattresses, this one
doesn’t restrict your movement at all. That's why it's one of the best
mattresses we've tested.
It’s may be the most expensive mattress on this list, but it’s also the best we’ve seen in years. This pocket sprung mattress contains several layers of foam, which may not be to everyone’s liking, but you’re in luck if you like the feel of it in the shop. You can sleep well in the knowledge that this mattress will support your spine for years to come without ever sagging or softening. It’s also a good bet for both restless and light sleepers because, while it’s very easy to turn on, it also does a great job at absorbing bounces.
For our money, this is one of the best mattresses around at the moment. It’s just as long-lasting as the mattress above and, although that one is slightly more suitable for light or restless sleepers, this one offers slightly superior support for your spine and will continue to do so for years to come.
We’ve seen cheaper Best Buys than this, but never before have we seen such a reasonably-priced mattress score so highly in our tough tests. It provides good support for everyone but it’s truly exceptional for people sleeping on their back. It’s also easy to roll over on and it won’t dip in the middle or sag, although it will get slightly softer over time.
It's not the cheapest, but this is the best pocket-sprung mattress with natural fillings we've seen in years. It didn't do badly in any of our tough tests and it's particularly impressive at supporting people sleeping on their back. It doesn't restrict your movement at all, either, which is great news if you like to switch sleeping positions several times during the night.
It's rare that we test a poor mattress from this brand, and this one doesn't disappoint. It's supportive for both larger and smaller people when new and it doesn't sag, soften or become less supportive over time. It's also suitable for restless sleepers, as it's very easy to roll over on. Doing so may disturb a light-sleeping partner, however, as it isn't the best at preventing the transfer of movement from one side of the bed to the other.
This is the cheapest mattress on this list, but it still manages to combine foam, pocket springs and memory foam to excellent effect. It provides good all-round support, and is particularly good at supporting your spine when you’re sleeping on your back. Better yet, even after years of use, you’ll be getting the same quality of support without any signs of sagging. The only things to bear in mind are that it’s a little awkward to rotate and, unlike some of the other online-only mattresses on this list, it doesn’t come with a 100-night sleep trial.
It's far from cheap, but this mattress combines pocket springs and memory foam to excellent effect. It provides good all-round support and the memory foam doesn't make it tricky to turn over on this mattress. You can count on this long-lasting mattress to still feel like new in years to come, too, so it could prove to be a good investment.
Not found the mattress for you? See all our Best Buy mattresses recommendations.
...and here's three mattresses to avoid
Even if you find these mattresses fantastically comfortable when you try them in the shop, we would advise against adding them to your short list. Comfort doesn't guarantee support or durability, and all three mattresses have serious flaws in at least one of these areas.
This mattress has the word ‘ortho’ in the name, so it must be supportive, right? Well, not according to our rigorous body-support tests. They revealed that, regardless of whether you lie on your side or back, this mattress doesn’t do a great job at keeping your spine in the correct position. To make matters worse, it will also sag with time.
Despite coming from a well-respected brand, you'll want to think twice before buying this mattress. It provides poor support for people sleeping on their back and, over time, the support for back-sleepers becomes even worse while the mattress also sags dramatically.
Pocket sprung mattresses with natural fillings can be very expensive, so this option is temptingly priced. But it’s not the bargain it might seem. Not only is this mattress unsupportive for most people, but it will also sag very noticeably after you’ve been using it a while, which is likely to make it less comfortable.
Which? members can log in to view all our recommendations in the table above.
Which? mattress reviews
Not only does no one else test mattresses like us, but we’re also totally independent, so you can have complete confidence in our results.
If you tend to sleep on your back, a good mattress will keep your spine in the same shape as when you’re standing. So, we measure the shape of a person's body at 36 different points when standing, and then again when lying on their back on the mattresses, to see how well they compare. If you’re a side-sleeper, your spine should be parallel to the mattress, so we use a laser to measure the angle of a person's spine relative to the bed.
After simulating several years of use by rolling a heavy barrel over the mattress thousands of times, we then repeat the body-support tests to see whether the mattress becomes less supportive over time.
That’s not all. With our results, you can see how breathable a mattress is, how easy it is for you to turn over on and how stable it is. If you’re a light sleeper, you should try and buy a mattress with five stars for stability. These are the best at absorbing bounces, so you’ll be less likely to be disturbed when your partner rolls over or gets up in the night.
If you’re not yet a Which? member and want access to all these results and more, join Which? now.