AirGrid® Seat and Back Deluxe Task Chair. Breathable AirGrid® Seat and Back with Built-in Lumbar Support. One Touch Pneumatic Seat Height Adjustment. 2-to-1 synchro Tilt Control with Adjustable Tilt Tension. Height Adjustable Angled Arms with Soft PU Pads. Heavy Duty Angled Nylon Base with Oversized Dual Wheel Carpet Casters.