100% Premium Therapeutic Grade Foam Cloud Cushion. Will Not Flatten Out With Prolonged Use. Ergonomically Designed To Relieve Pain And Tension From The Lower Back, Coccyx, Tailbone, Hip, Spine, And Sciatic Areas Promotes Good Posture, Spine Alignment, And Healthy Weight Distribution For Hours Of Comfortable Sitting Superior Comfort For Any Chairs, Bench, Car Seat, Plane Seat, Or Wheelchair Removable Velour Cover Is Machine Washable For Easy Cleaning.