Executive High Back Computer ChairLockable Tilt Function The chair's backrest can be reclined back and locked, which helps relieve stress on the lower back muscles and relax the lumbar area, allowing you to relax from heavy work. The tilt range is 90 degrees to 135 degrees. Dynamic Lumbar Support & Height Adjustable This ergonomic office chair supports the natural curve of the spine and keeps you in good posture. Pneumatic controls make it easier to raise or lower the seat, which