The Office Star Air Grid Back Deluxe Task Chair with Mesh Seat has thick padded contour seat with built-in lumbar support. This mesh back chair features active lumbar support. The mesh screen back provides increased breathability. One touch pneumatic seat height adjustment allows quick and easy adjustment and regulates the height of the chair relative to floor. Tilt tension controls the rate and ease with which the chair reclines for different weights and strength of users. It features height adjustable angled arms with soft pads, and heavy duty angle nylon base with oversized dual wheel carpet casters for easy movement.