This multi-functional office chair features a triple paddle control to adjust the seat height, back angle and tilt lock. This chair offers great comfort benefits when having to sit for long periods at a time. Having the support of an ergonomic office ch air 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. The lock ing back angle adjustment lever changes the angle of your torso to reduce disc pressure. 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.