Breathable AirGrid Back with Built-In Lumbar Support.Thick Padded Black Mesh Seat.Pneumatic Seat Height Adjustment.2-to-1 Synchro Tilt Control with Adjustable Tilt Tension.Gunmetal Coated Padded Flip Arms with PU Pads.Heavy Duty Angled Nylon Base with Oversized Dual Wheel Carpet Casters.