Drive Medical's Gel "E" 3" Wheelchair Cushion with Gel Bladder is a pressure-reducing cushion, designed to assist in the prevention, treatment, and management of pressure ulcers. The viscous gel bladder provides optimized pressure reduction, support, and comfort. Seat pad is 22 by 18 inches and supports up to 500 pounds. The polyurethane foam shell is fire retardant and the removable, replaceable cover has a water-resistant top and non-slip vinyl base, ensuring the user's safety. Backed by an 18-month limited warranty from Drive Medical, a leading brand of mobility aids and other medical goods for more than 20 years, you can purchase with confidence.