Medium Grey Ergonomic Office Chair CH555 by Alvin - This office chair is designed for the ultimate seating comfort offering extensive ergonomic features. The office chair seat & back cushions constructed with molded foam, providing more comfort, stability, and durability. The office chairs ergonomic features that provide lumbar support, include: a contoured 2 1/2" padded office chair backrest that adjusts forward and back and higher or lower; 19" x 17" seat cushion; The Alvin Monarch ergonomic office chair has a two lever adjustment system. One of the ergonomic levers adjusts the seat and back to tilt forward or back with ease. The other ergonomic lever is a pneumatic fingertip adjustment that raises the chair from 18" to 23". The office chairs has a rugged 5-star black base for stability, and 5 hooded dual casters for easy mobility. Shipping weight 38lbs. Limited 2 year warranty on the gas cylinder and 3 year warranty against defects in material and construction (except fabric) All fabric and foam meet strict California and BIFMA codes. The styling, comfort and construction make the Alvin Monarch ergonomic office chair and an outstanding value.