Ergonomically designed to support the spine in the proper position for seating comfort all day long. Adjust the shape and thickness of the cushion to customize comfort. Allows the spine to assume its natural "S" shaped curve. Adjusts easily for individualized comfort and support. Ideal for use in office, home, car or plane. Adjustable strap holds cushion in place. Deluxe Lumbar Support 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.