HealthSmart 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 coccyx cushion comes with a washable cover and a handle for easy transporting.