Boss Office Products B7501 Executive High Back LeatherPlus Chair in Black Beautifully upholstered in black LeatherPlus LeatherPlus is leather that is polyurethane infused for added softness and durability; Passive ergonomic seating with built-in lumbar support Padded armrests covered with Caressoft upholstery Large 27" nylon base for greater stability; Hooded double wheel casters Upright locking position; Pneumatic gas lift seat height adjustment; Adjustable tilt tension control