High Back Multi Function Ergonomic Chair with Ratchet Back Height and 2-way Adjustable Arms. Specifications: Thick Padded Contour Seat and Back with Built-in Lumbar Support One Touch Pneumatic Seat Height Adjustment Multi Function Control with Adjustable Tilt Tension Ratchet Back Height Adjustment Height and Width Adjustable Arms with PU Pads Heavy Duty Nylon Base with Dual Wheel Carpet Casters