Beautifully upholstered in LeatherPlus. LeatherPlus is leather and polyurethane for added softness and durability. Passive ergonomic seating with built-in lumbar support. Durable polypropylene arms. Upright locking position. Pneumatic gas lift seat height adjustment. Adjustable tilt-tension control. Large 27'' nylon base for greater stability. Hooded double wheel casters. Matching guest chair with cantilever base.