Durable task chair adjusts for your comfort with back-height adjustment, seat-height adjustment on the waterfall seat and arms that adjust in height and width. Waterfall design reduces pressure at the back of the knee for good blood flow. Use the back-height ratchet adjustment to raise or lower for support in the lumbar region. Both back and seat are upholstered in fabric and thickly cushioned to enhance how they mold to your body as you work. Functions also include 360-degree swivel, tilt tension control, center tilt and tilt lock. Nylon five-star base is equipped with smooth-rolling casters for easy mobility. Weight capacity is 275 lb. Seat measures 20″ wide x 19″ deep and adjusts in height from 19-3/10″ to 22-4/5″. 18-1/2″ wide back adjusts in height from 19-1/2″ to 22-1/2″.