Breathable Dark Air Grid Back with Built-in Lumbar Support.Thick Padded Black Bonded Leather.Seat Pneumatic Seat Height Adjustment.2-to-1 Synchro Tilt Control with Adjustable Tilt Tension Height.Adjustable Angled Arms with Soft PU Pads.Heavy Duty Angled Nylon Base with Oversized Dual Wheel Carpet Casters.This product has achieved GREENGUARD Certification.