Forward tilt of the seat cushion relieves stress from the lower spine and pelvic area. Adjust the shape and thickness of the cushion to customize comfort. When used as a back cushion, provides proper seat depth dimension. Adjusts easily for individualized comfort and support. Ideal for use in office, home, car or plane. Adjustable strap holds cushion in place. Deluxe Seat/Back Cushion with Memory Foam—Memory Foam conforms to the body's natural curves, providing maximum relief. Back Support Type: Chair; Material(s): Memory Foam; Polyurethane; Color(s): Black; Adjustability Features: Adjust Shape; Thickness.