This ergonomically designed office chair offers plenty of adjustable features to get to your desired comfort level! The triple paddle control feature controls your seat height, back tilt position and knee tilt. The locking back angle adjustment lever changes the angle of your torso to reduce disc pressure. The most valuable feature of this chair is the controlled lumbar knob that allows you to increase and decrease the pressure provided to your back. 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 locking tilt mechanism allows you to lock your chair in a comfortable work position. The waterfall front seat edge removes pressure from the lower legs and improves circulation. 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.