Amazingly comfy & cooler than memory foam, the Airstream Topper will revolutionise your mattress comfort. The topper is 4.5cm thick so it’s deep enough to support your contours keeping you spine nice and straight. What’s more, it’s proven to be significantly cooler than memory foam thanks to Slumberdown’s clever Airstream technology. Please note this product has been vac-sealed to reduce its carbon footprint. Upon opening, please shake the topper and lie it flat to allow the topper to recover fully. Suitable for king size beds. Cover made from 100% polyester microfibre. 100% polyester reverse. 100% polyester filling. Secured by elasticated corner straps. Non-allergenic. Cover is machine washable covers at 40C.