Drive's Premium Guard Gel/Foam Overlay helps stave off pressure sores. The premium Guard gel/foam mattress overlay is designed for prevention, treatment and management of pressure ulcers. The mattress has an exterior egg crate top layer and ten gel bladders to relieve pressure build-up against the body. The cover of the medical overlay mattress is waterproof so there is no need to worry about fluid penetration. The Premium Guard Gel/Foam Overlay can support up to 300 pounds.