Beautifully upholstered In black LeatherPlus. LeatherPlus is leather that is polyurethane infused for added softness and durability. Passive ergonomic seating with built in lumber support. Upright locking position. Pneumatic seat height adjustment. Adjustable tilt tension control. Large 27" nylon base for greater stability. Hooded double wheel casters. Matching guest chair model (B8109).