Comfort: Put your comfort first - this mattress has a 19cm high profiled core of high-density foam, which provides great support as you sleep. Size options: A range of sizes from 80x180cm to 200x200cm. Mattress: Get a Sleep One mattress with removable cover Removable cover: Made from stretch fabric and machine washable. Expert-approved: Reflects research tested by sleep experts - the ideal mattress for relieving pressure areas of the body in all sleeping positions. and maintaining correct spinal alignment. Keep cool: With a highly breathable cover and a 4cm upper plate of viscoelastic gel that regulates body temperature.