The Full Tilt locking mechanism gives you control over the suspension of the chair.  The mechanism can be locked when sitting upright or unlocked to allow for gentle rocking giving you the optimum comfort every time you sit down.The Multi Functional Tilt mechanism has all the features of the full tilt locking mechanism with two control levers, giving you full control over the suspension of the chair. The mechanism can be locked while in a tilt position or even be titled in backwards in an upright position allowing you to lock the chair at desired angles.