Modern ergonomic mesh back office chair, designed to provide exceptional back support and to prevent body heat and moisture build up. Ratchet back adjustment with active lumbar support. Breathable mesh seat. Adjustable arm rests (up/down/in/out). Steel frame and 27" base with chrome finish. 2 to 1 synchro-tilt mechanism with adjustable tilt tension control. Pneumatic gas lift seat height adjustment. Hooded double wheel casters