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. Unique patented system of interchangeable foam inserts provide personalized comfort and support. Helps reduce back strain and fatigue caused by improper seating posture. Hook and loop strips hold cushion in place on fabric seating and an adjustable strap is provided for smooth surfaces. Machine washable and flame retardant.