Infinity Task Chair features advanced lumbar support. Infinite support lumbar technology provides back support while perching on the 6-1/4″ thick seat cushion. With the simple touch of the fingertip control, the back will move forward to support you at any sitting position. Other customizing comfort functions include pneumatic seat-height adjustment from 19-3/4″ to 22-3/4″, 360-degree swivel, tilt, tilt tension and tilt lock. Height-adjustable arms and base are made with durable black nylon. Seat and back are upholstered in fabric. Five-star base is equipped with hooded, dual-wheel, 50mm plastic casters. Weight capacity is 275 lb. Chair is endorsed by the American Chiropractic Association.