Coccyx Orthopedic Comfort Memory Foam Seat Cushion Ideal for Chair, Car Seat, Wheelchair to Decrease Pressure & Promote Spine Alignment to Reduce Low Back Pain and Discomfort Due to Prolonged Sitting Polyester Plush inner foam reduces pressure on the coccyx, tailbone and hip bones. Perfect for chairs, car seats, planes or wheelchairs. Promotes healthy weight distribution, posture and spine alignment. Take action against lower back pain, pressure sores or discomfort from prolonged sitting. Removable soft polyester and rayon cover zips off for machine washing.