The 3121 2-to-1 Synchro Tilt Managers Chair with Adjustable PU Padded Arms features: Thick Padded Contour Back with Built-in Lumbar Support / Thick Padded Contour Seat / One Touch Pneumatic Seat Height Adjustment / 2-to-1 Synchro Tilt Control with Adjustable Tilt Tension / Height and Width Adjustable Arms with PU Pads / Heavy Duty Nylon Base with Dual Wheel Carpet Casters / This product has received GREENGUARD certification