This Office Task Chair has multi-functional controls which makes this chair a pleasure to use. When standard office chairs have your legs, back, and neck aching, this chair is the right choice for you. Featuring an overstuffed seat and back that allow true ergonomics, this chair is sure to be the cure for all your chair-related fatigue. GO-930F-BK-GG Ergonomic Mid-Back Office Chair, Black Fabric Upholstery, 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 Office Chair 1