Boss Office Products B2007-GY Extended Comfort Commercial Fabric Adjustable Office Chair in Grey Fabric High-Back chair with lumbar support; Elegant styling upholstered with commercial grade fabric Adjustable height armrests with soft polyurethane pads; Seat tilt lock allows the seat to lock throughout the tilt range Back angle lock allows the seat to lock throughout the angle range for perfect back support Ratchet back height adjustment mechanism Pneumatic gas lift seat height adjustment; Adjustable tilt-tension control