Duro-Med DuroGel II Deluxe Gel-Foam Wheelchair Cushion is a two-chamber flotation cushion that combines the top layer of gel with the bottom layer of foam to prevent bottoming out and promotes seating stability. Enclosed in the cushion, is a heat-sealed 20-gauge vinyl pouch. The black cover is made of three-way stretch fabric with waterproof backing; washable and removable. The convenient tie straps hold the cushion securely in place. The size of the cushion is 16" x 16" x 2-1/2" and is a small weight of 8lbs.