Mid/high back syncro-tilter chair. Breathable black mesh backrest with high-density, injection-molded foam seat. Pneumatic seat height adjustment. Ratchet height adjustable lumbar support. Height-adjustable, swivelling, and telescopic arms with forward-backwards movement. Synchronized seat and back movement in a 3:1 ratio. Mechanism locks in the upright position Tilt tension adjustment. Multi-surface casters for carpet and hard floors. BIFMA tested.