The Protekt Serenity Gel Overlay utilizes a series of gel bladders encapsulated between high density, resilient, contoured foam and a firm support base. This composition creates a cost-effective pressure redistribution group and support surface.Features and Benefits of the Protekt Serenity Gel Overlay: Cover is a soft nylon, urethane coated, vapor permeable, waterproof fabric Top cover is non-shear, low-friction, and anti-microbial/bacterial 4 elastic corner straps secure the mattress overlay Gel maintains room temperature at all times Bariatric sizes available 16 CFR part 1632 & 1633 Weight capacity: 300 lbs. Size: 34" x 78" x 3.5" Warranty: one year non-prorated. PRO-90001 Protekt Gel Overlay Gel Overlay 34" x 78" x 3" PRO-90002 Protekt Gel Overlay Gel Overlay Bariatric 42" x 78" x 4" PRO-90003 Protekt Gel Overlay Gel Overlay Bariatric 48" x 78" x4"