Breathable ProGrid back with built-in lumbar support and one-touch pneumatic seat height adjustment Deluxe 3-position locking 2-to-1 synchro tilt control with seat slider and adjustable tilt tension Molded foam saddle seat and height, width and depth adjustable polyurethane foam padded arms for extra comfort Heavy duty nylon base with dual wheel carpet casters - Overall size: 28” W x 27” D x 41.25-44.75” H Approved for commercial use - This chair meets or exceeds ANSI/BIFMA standards