Self-Tilt Mid-Back Mesh Desk Chair features a bodyweight control mechanism that moves with you. This chair control allows your body weight to recline the chair and return the chair to its task position for easier control. Self-tilt tension adjustment offers five locking positions. Other functions include 360-degree swivel and pneumatic seat height adjustment. The height-adjustable arms are covered with polyurethane pads for your comfort. Recline easily with the mesh back and seat upholstered with fabric. Spider base is made of nylon and equipped with five dual-wheel casters for easy chair movement. Lorell