The Gravity 9 Pressure Redistribution Mattress by Drive Medical is the ultimate in pressure prevention multi-layered foam mattresses. With 4 layers of foam that include true memory foam and a heel slope, support and durability are maximized. A 6" to 4" heel slope and unique design of the foam target the prevention of heel ulcers. The Gravity 9 includes a full-length layer of true memory foam that puts comfort at a premium. For added safety, this model includes an elevated perimeter than assists in preventing bed falls. The cover provides functionality and convenience, as it is not only easy to clean, but it is also fluid proof, tear resistant, fire retardant, and low sheer. With a 450 pound weight capacity and an industry-best 15 year limited warranty, you can have peace of mind that this mattress will last. Drive Medical's Gravity 9 is the ultimate in foam pressure redistribution mattresses.