Sacro Back Cushion (15" x 15") Relieves lower back pain. Great for the home, car, or office. It Comes with an adjustable strap and works on any chair. The back Cushion is anatomically designed to maintain correct spinal alignment. Back muscles stay relaxed and minimize back fatigue. Cushion Promotes better leg circulation. It Holds the lower spine in an upright position. Washable and removable cover. Black