Boss Executive High Back Leatherplus Chair; Adjustable tilt tension control.; Padded armrests covered with Caressoft upholstery.; Upright locking position.; Arm height 26.5"-30" H; Finish Black; Large 27" nylon base for greater stability.; Passive ergonomic seating with built-in lumbar support.; Pneumatic gas lift seat height adjustment.; Hooded double wheel casters.; Beautifully upholstered in black LeatherPlus.; Seat Size 21" W x 19" D; Overall Product Dimensions 27" W x 28.5" D x 43.5-47" H Optional knee-tilt mechanism available (B7502).; Color Black; Fabric LeatherPlus LeatherPlus is leather that is polyurethane infused for added softness and durability.