Upholstered in black fabric. Passive ergonomic seating with built in lumbar support. Upright locking position. Pneumatic gas lift seat height adjustment. Adjustable tilt tension control. Large 27-inch nylon base for greater stability. Hooded double wheel casters. Arm Height: 25-inch -28.5-inch H, Seat Size: 20-inch W x 19-inch D, Seat Height: 18-inch - 21.5-inch H, Overall Size: 27-inch W X 27-inch D X 40.5-inch - 44-inch H. Assembly instructions also available at www.bosschair.com.