Duro-Med Seat Mate - Sloping Coccyx Cushion is ideal for prolonged periods of sitting. The U-shaped opening helps relieve pressure on the coccyx/tailbone, in an effort to relieve lower back pain. Constructed of polyurethane foam, this seat cushion provides maximum comfort and durability. Use it at home, work or at the office. The Duro-Med coccyx cushion comes with a washable cover and a handle for easy transporting.