AbsolutelyNew ZI200 BackSling Ergonomic Chair Cushion for Back Support Makes any chair ergonomic; Reduces muscle fatigue and discomfort; Reduces muscle fatigue and discomfort Self adjusting lumbar support easily conforms to fit your body; Self adjusting lumbar support easily conforms to fit your body Creates a soothing stretch for the lower back; Reduces lateral pressure on the spine and tailbone; Helps improve posture Comfortable easy-to-clean fabric; Made of 100% polyester and polyurethane foam Measures 52 x 17