Smooth contoured surfaces provide maximum comfort. Back is contoured with built-in lumbar wedge, while the waterfall seat edge helps relieve pressure points on legs. Push-button control for seat height and back tilt. Push button back tilt mechanism can remain open or lock into position. 5-star 24" diameter nylon base with 2" casters. Chair measures 24"W x 24"D x 37 to 41"H overall. Meets or exceeds ANSI/BIFMA standards. Optional armrest provides 3" height adjustment at seven positions. Arms ratchet in or out at three positions. Guest seating is also available in the Cava ® Collection Task Seating group. Some assembly required