The Orthopaedic Seat Cushion with Removable Pad provides superior comfort for any chair, bench, car seat, plane seat or wheelchair. Ergonomically designed to relieve pain and tension from the lower back, tailbone, hip, spine, and sciatic areas. Coccyx pad detaches easily from unit for extra relief over pressure points. 3” thick sculpted foam – will not flatten out with prolonged use. Removable and machine washable cover.