Stay cool with a contoured four-way stretch mesh back and seat that supports your every move. Pneumatic seat height adjustment moves the seat up and down to adapt to various body heights. 360°-swivel provides freedom of movement in any direction. Upright tilt lock secures the chair in the many upright positions. Tilt tension controls the rate and ease of recline. Headrest offers added support for the head and neck while reclining.