ProGrid® Back Managers Chair with 2-Way Adjustable Arms and Dual Function. Breathable ProGrid® Back with Built-in Lumbar Support. One Touch Pneumatic Seat Height Adjustment. Dual Function Control. Ratchet Back Height Adjustment. Custom Fabric Saddle Seat with Molded Foam. Height and Width Adjustable Arms with PU Pads. Heavy Duty Nylon Base with Dual Wheel Carpet Casters.