Pressure redistributing cushion designed to assist in the prevention, treatment and management of pressure ulcers;Viscous gel bladder is encased in a fire retardent polyurethane foam shell and provides optimal pressure redistribution, support and comfort;Top of cover is a urethane-coated nylon that is low-shear, vapor permeable and water-resistant;Base of cover is waterproof vinyl for durability;Product Dimensions: 18(L) x 16(W) x 3(H); Weight Capacity: 275 lbs