We've pitched the Simba Hybrid mattress against 19 others in our latest tests, including mattresses from Dreams, Furniture Village and Next.
You're likely to have seen ads for Simba's Hybrid mattress, promising 'gravity-defying comfort' and 'cooler sleep' thanks to its five layers, which include a combination of back-hugging springs and memory foam.
At £569 for a double, currently reduced from £769, the Simba Hybrid is fairly cheap among its online rivals. But cost isn't an indicator of quality. Our latest tests have found Best Buy mattresses from as little as £200 up to £950, so there's something to suit every budget.
Seven of the 20 new mattresses we tested this time round earned a Best Buy recommendation, which means they'll support your back, even after years of use. But our lowest scorer in this round of testing achieved just 50%.
Previous versions of the Simba mattress have generally given good support, but our tests did reveal differences between the performance of this version and the older ones.
The Hybrid is Simba's best selling mattress. It's made up of five layers: a 16cm foam core with a mini pocket-spring layer sandwiched between two layers of foam, topped with another 2.5cm of foam.
It's a bed-in-a-box mattress, so it's delivered vacuum-packed in a box to your door and it comes with a 200-night trial. If you decide to return it, Simba offers a free return. Its website states that it won't ask you to get the mattress back in the box for its return journey. If you keep, it, the mattress comes with a 10-year guarantee, too.
Simba currently has three mattresses in its core range, and we've tested them all.
Bed-in-a-box mattresses are big business, but in previous years we've found most people still prefered the idea of mattress shopping in a store.
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