The REVV Series - Self Adjusting SpaceFlex Back Chair with Self Adjusting Mechanism features: / Self Adjusting SpaceFlex Backrest Support System in Cosmo / Thick Padded 2-Layer Mesh Seat in Raven / Pneumatic Seat Height Adjustment / Self Adjusting Mechanism Adjusts Tilt Tension by Using your Body Weight as a Counter-Balance Resulting in Perfect Balance as you Recline / Mechanism also Features Backrest Lock and Anti-Kickback / Height-Adjustable Arms with PU Pads / Heavy Duty Platinum Finish Base with Black End Caps and Oversized Dual Wheel Carpet Casters / Has achieved GREENGUARD Certification