BOSS Office Furniture HI-BACK EXEC CHAIR WITH MAHOGANY 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. Hardwood arms accented with upholstered pads. Hardwood caps, on 27" steel leg base, for greater stability. Hooded double wheel casters. Upright locking position. Pneumatic gas lift seat height adjustment. Adjustable tilt tension control. Available in three elegant wood finishes: B8376-K Medium Oak B8376-C Cherry B8376-M - Traditional Cherry.