The Airstream Memory Cool Topper is 4.5cm thick offering a firmer support, with elasticated straps the breathable topper is the perfect choice for added support. The soft knit Coolmax cover is designed to wick moisture away and is cool to touch. Mattress toppers can help prolong the life of your mattress, whilst adding an extra layer of comfort and support. With a range of sizes and finishes you can tailor your support and comfort to suit your needs. - Slumberdown Airstream Memory Cool Mattress Topper in White - Size: King