If the surface of your mattress tends to trap heat and sleep warm, then a breathable topper can provide better temperature regulation to help you sleep more comfortably. The best cooling mattress topper materials include ventilated latex, natural wool, and open-cell foam. Performance (including how well it supports your body, pressure distribution, breathability and stability) (55%) Saatva offers a lineup of mattress toppers, each with unique strengths. Our tests show that the Graphite Mattress Topper excels at pressure relief thanks to the close contouring, making this an ideal topper for sleepers who experience pressure buildup or simply enjoy the “hugging” feel of foam. Discover which mattress brands Which? members are the most satisfied with, in our guide to the best mattress brands. How much does a good mattress cost?

The Which? overall score is a percentage. It takes into account only the results of our tests and ignores price. But we've been impressed by basic foam mattresses in the past, and if you're just looking for a cheap-and-cheerful mattress it might be just the thing. A Great Value mattress must also score three stars or better for durability and three stars or better in all our key body support tests.

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We assess how easy it is to roll over on the mattress for when you want to switch sleeping positions during the night. Some mattresses restrict your movement or, even worse, dip in the middle, meaning it requires a lot more effort to roll over. A good mattress topper should be able to alter the feeling of your mattress. In our survey, 47% of members told us they use a topper to make their mattress softer, so we test using a standard mattress and calculate the change in firmness when using the topper with it. Two adults will find a small double mattress pretty snug, but it could be just the thing for a small bedroom or if you sleep alone but like room to stretch out.

The main difference between an air mattress and an air bed is that the former is designed to be used indoors, while the latter is for outdoor use. What is the lifespan of an air bed? If your hips, shoulders or another part of your body sinks into one section of a mattress too much, it could cause pressure in this area and therefore, may lead to discomfort. The length is the same, but it’s 10cm (3in) wider, giving you a touch more space to roll over and switch sleeping positions during the night.

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A good mattress topper should help make a difference when distributing your body pressure evenly over the surface of your topper and mattress, so that your shoulders or hips, for example, don’t start to dip in one area. Change in firmness