Ergonomic Mid-Back Office Chair, Made of Eco-Friendly Materials, Pillow Top Cushioned Seat and Back, Height Adjustable Back, Back Height Adjustment Knob, Asynchronous Seat and Back Angle Adjustment, Infinite Locking Seat and Back Angle Adjustment, Seat Angle Adjustment, Tilt Tension Control Knob, Pneumatic Seat Height Adjustment, Heavy Duty Nylon Base, Dual Wheel Casters, Black LeatherSoft Upholstery, LeatherSoft is leather and polyurethane for added Softness and Durability, CA117 Fire Retardant Foam