Mid-back work chair is designed to provide comfortable support to those who spend more than half the day at their desk or computer. Mesh back delivers responsive seating. Arms adjust in height and width. Functions include pneumatic seat-height adjustment from 17-1/2" to 22", seat glide mechanism, back-height adjustment, 360-degree swivel, dual-action synchro tilt, and tilt tension. Synchro-tilt allows the back to recline twice as fast as the seat. As the back reclines, the seat remains relatively level, promoting leg circulation and ergonomic function. Design features a five-star base and swivel casters. Mid-back chair meets or exceeds applicable ANSI/BIFMA standards.