Breathable ProGrid Back with Built-in Lumbar Support, One Touch Pneumatic Seat Height Adjustment, Deluxe 3-Position Locking 2-to-1 Synchro Tilt Control with Seat Slider, Mesh Saddle Seat with Molded Foam, Height and Width Adjustable Arms with PU Pads, Heavy Duty Nylon Base with Dual Wheel Carpet Casters