Boss - BOPB8551BK Executive Chair is the perfect complement to any office. Upholstered with LeatherPlus, a combination of leather and polyurethane that promotes exquisite softness and durability, this chair is more than capable of taking comfortable seating to a new level. Passive ergonomic seating has integrated lumbar support for your lower back. Padded, flip armrests covered in the same elegant upholstery help you stay comfortable through extended use. Upright locking position stays securely positioned. It also includes pneumatic, gas lift, seat-height adjustment; spring-tilt mechanism and adjustable tilt tension control.