Self adjusting SpaceFlex Backrest Support System with Breathable Mesh Seat.One Touch Pneumatic Seat Height Adjustment.Deluxe 2-to-1 Control with 3 Position Lock and Anti-Kick Function..Locking Tilt Tension Adjustment.Height Adjustable Platinum Coated Arms with Soft PU Pads.Heavy Duty Platinum Coated Base with Black End Caps and Dual Wheel Carpet Casters.