Executive high-back chair features active lumbar support & a mesh screen back. Mesh screen back provides increased breathability while adjustable, padded lumbar support maintains the natural curve of your spine. Functions include one-touch pneumatic seat-height adjustment, 360-degree swivel, tilt, tilt tension, tilt lock & synchronized knee tilt (2-to-1 synchro tilt). Headrest adjusts in height & depth. Arms have soft pads & adjust in height. Seat size is 21-7/8" wide x 19-1/8" deep x 18-4/5 to 23" high. Back size is 20-5/8" wide x 29-3/4" high. Distance between arms is 19". High-back chair features a thickly padded contoured mesh seat, heavy-duty metal base, & oversized, dual-wheel carpet casters.