This gel memory foam mattress is made with eco-friendly CertiPUR-US foam for performance, durability, and sustainability. It features nine inches of support foam and three inches of memory foam topped by two inches of gel memory foam. The gel foam allows heat to dissipate through the mattress to make the surface cooler. Oeko-Tex breathable covers are certified to be free of harmful substances. The removable, cooling knitted top is soft, comfortable, and helps keep you cool for more restful sleep.