This multi-functional office chair features a dual paddle control to adjust the seat height and controls the tilt function. The locking tilt mechanism allows you to lock your chair in a comfortable work position. Having the support of an ergonomic office chair may help promote good posture and reduce future back problems or pain. High back office chairs have backs extending to the upper back for greater support. The high back design relieves tension in the lower back, preventing long term strain. Chair easily swivels 360 degrees to get the maximum use of your workspace without strain. The pneumatic adjustment lever will allow you to easily adjust the seat to your desired height. The adjustable armrests take the pressure off the shoulders and the neck, which minimizes the risk of pain.