The Comfort Co - Elements with GEL Seat Cushion is available in both the 2" and 3" single layer foam construction with QuadraGel pack inserts. The QuadraGel Pack regulates body temperature and redistributes pressure for comfort. Gel contours to the body for a comfortable fit. Removable cover with non-skid velcro attachments on bottom of cover. Cover is made of Comfort-Tek Fabric (leathery type material that cleans easily and helps alleviates pressure on bony prominences.) Available in sizes: 16" x 16", 16" x 18", and 18" x 18". Call customer service for other special order sizes 1-800-633-2139. Weight capacity: 250 lbs