Memory P.f. Coccyx Cushion is designed to relieve pressure and provide a comfortable seat for individuals sitting in wheelchairs. This cushion includes molded, 6 lb. density memory foam that gives outstanding support and comfort. The rear cutout is designed to relieve pressure on coccyx area from seat. 18″ x 16″ x 3″ cushion will fit most standard wheelchairs. Latex free cushion is encased in a washable black zippered cover.