The Coccyx Gel Cushion is a foam wheelchair cushion designed for use by individuals with lower extremity and mobility disabilities and spinal cord injury. Designed to relieve pressure to the spine for wheelchair users, this cushion is made of a high density foam and gel combination for added strength and durability. It features a square shaped cutout for the coccyx to aid in proper weight distribution. DIMENSIONS (LxWxH: 18 x 16 x 3.5 inches. COLOR: Blue.