The high back of this office chair extends to the upper back to provide greater lumbar support. This definitely helps my posture. The mesh office chair with its comfortable and airy design allows you to maintain higher productivity throughout the working day. The back support is soft but sturdy and doesn't feel like other cheap chairs. Synchronous tilt control tilts the back of the chair and seat at different rates, increasing the angle between the torso and thighs. The contoured seat eliminates pressure points for increased comfort. The chair can be easily rotated 360 degrees to make the most of your work space without stress. Pneumatic adjustment levers allow you to easily adjust the seat to the desired height. The heavy metal base is designed to meet the needs of frequent chair use.