Boss Office Products B7602 Executive LeatherPlus Chair with Padded Arms and Knee Tilt in Black Beautifully upholstered in Black Leather Plus; Comes standard with knee-tilt mechanism LeatherPlus is leather that is polyurethane infused for added softness and durability Pillow Top Design with a perforated center; Pneumatic gas lift seat height adjustment Padded armrests covered with Caressoft upholstery; Adjustable tilt tension control Large 27" nylon base for greater stability; Hooded double wheel casters