The singular air grid back provides remarkable comfort at the office. A mesh seat is perfect for years of frequent use without concern for stains or wear. The chair also features extra large carpet casters and a swivel pneumatic height lever.The nu mber of comfort features it offers is impressive. Tilt control and adjustable tilt tension will quickly become some of your favorites. The back to seat tilt ratio is two to one so the seat will lean back with you but remain relatively level with the floor