Office Star Exec. High-Back Chair,Adjust. Height/Depth,27"x27"x55",BK Executive high-back chair with active lumbar support features a mesh screen back. Mesh screen back provides increased breathability while adjustable padded lumbar supports better maintain the natural curve of your spine. Features height-adjustable and depth-adjustable headrest, thickly padded contoured mesh seat, heavy-duty metal base, pneumatic seat height adjustment, 360-degree swivel, tilt, tilt tension, tilt lock, synchronized knee tilt (2-to-1 synchro tilt), height-adjustable arms with soft pads and dual-wheel casters and infinite lock tilt.