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. Coal FreeFlex® Fabric Saddle Seat with Molded Foam. Height and Width Adjustable Arms with PU Pads. Heavy Duty Nylon Base with Dual Wheel Carpet Casters.