The SKILCRAFT® Kensington® ergonomic backrest and adjustable straps works in nearly any chair. Easily customize back rest height for maximum firm support of spine and lumbar region. Four independent springs conform to fit body shape and articulate with posture and position. Ventilated supports allow for air circulation. Easy-to-remove nylon fabric cover can be machine washed as needed. General Category: Seating Accessory; Sub-Category: Backrest; Color(s): Black; Color Family: Black.