Big & Tall Chair features Flexible Air technology to pivot & conform to your movement & provide continuous proper lumbar support. Both cushioned seat & back are upholstered in durable commercial-grade, black bonded leather. 7" thick seat cushion & 7-1/4" headrest cushion enhance your comfort. Silver finish on the heavy-duty arms & base offer a professional, coordinated look. Fixed arms offer an inviting resting place with thick foam padding. Easily customize your comfort with the fingertip control for pneumatic seat-height adjustment from 20-1/4" to 23-1/4", tilt & tilt lock function. Posture mechanism lets the back angle adjust independently of the seat & can be locked in an infinite number of positions. Other functions include 360-degree swivel & tilt tension. Five-star nylon base is equipped with five hooded, dual-wheel 50mm casters for easy chair movement. Weight capacity is 400 lb. Chair is endorsed by the American Chiropractic Association.