20 inches wide, 16 inches deep, and 3 inches high. Black. Designed to provide comfort and stability with a simple, economical design. Aerated foam keeps the patient cool and dry. The low shear water-resistant stretch cover helps maintain sensitive skin tissue. The vinyl bottom is waterproof. Convenient 12" tie straps secure the cushion to wheelchair. Meets flammability standard TB117. . WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov