Canopy's premium-quality, 2.5-lb density Hypoallergenic Memory Foam Mattress Topper dramatically improves your old mattress or makes a new mattress even more comfortable. To minimize pressure on sensitive areas of the body, this topper is composed of two layers: a 2" base foam and a 2" layer of high-density visco-elastic memory foam. Memory Foam responds to your body heat and weight, reducing pressure points for lasting, consistent comfort — and less tossing and turning — for a deeper, more restful night's sleep. This topper also has a removable, hypoallergenic, 100% cotton cover that's machine washable to make life easier.