Resilient, sleek, extended-height mesh chair features black mesh fabric back, a black vinyl seat and footring. Comfortable, ergonomic, height-adjustable seat is designed for all-day comfort and prevents fatigue. Chair holds up to 250 lb. Seat height adjusts pneumatically from 23″ to 33″. Other functions include tilt, tilt tension, tilt lock and 360-degree swivel. Seat size is 18″ wide x 17-1/2″ deep. Back measures 17″ wide x 15-1/2″ high. 25″ five-star base has 2″ hooded dual-wheel carpet casters. Fixed loop arms are sold separately. Chair meets applicable ANSI/BIFMA standards.