Big & Tall Chair features Flexible Air technology to pivot and conform to your movement and provide continuous proper lumbar support. Both cushioned seat and back are upholstered in durable commercial-grade, black bonded leather. 8-1/4" headrest cushion and 6-3/4" thick seat cushion enhance your comfort. Task arms and base feature a silver finish for a professional, coordinated look. Easily customize your comfort with the fingertip control for pneumatic seat-height adjustment from 19-3/4" to 22-3/4" , tilt and tilt lock. Other functions include 360-degree swivel and tilt tension. Five-star nylon base is equipped with five hooded, dual-wheel, 50mm casters for easy chair movement. Seat size is 24" wide x 19-1/4" deep while the back is 21"-24" wide x 33-3/4" high. Weight capacity is 400 lb. Chair is endorsed by the American Chiropractic Association.