DMI Seat Mate Sloping Coccyx Cushion 14” X 18” X 3” to 1-1/2” With Navy Removable Washable Cover, New Never Opened For Use with Chairs and Wheelchairs, Provides relief to tailbone and lower back pain. I love this cushion. Since my back surgery. I can’t sit in a chair without one. I just ordered one too many. Great to have one in the car and at home. From a No Pets and Non-Smoking Clean house