This DuroGell II Gel-Foam Cushion provides the ultimate in comfort and convenience. It is uniquely designed with a gel-filled chamber, which is encased in soft foam and covered with a heavy duty vinyl pouch. This gel foam combination helps prevent the cushion from flattening, even through repeated use. This cushion promotes seating stability for maximum comfort, and the soft foam conforms to the body's contours. The cushion is easy to clean and maintain and comes with a removable, machine washable, black velour three-way stretch fabric cover with waterproof backing that features convenient rear tie straps to hold the cushion securely in place.