NO LONGER AVAILABLE. The Zamp z-tech series 4A head Restraint has new features never seen before in the head and neck Restraint market. These new patent pending features include advanced axis adjustments that allow you to easily adjust shoulder width, arm angle and arm width. The Super lightweight construction makes it extremely comfortable, like you have nothing on. Specialized fiberglass reinforced nylon is used for the shoulder frame offering leading structural characteristics. Arms made with a modified alloy material give the device a dampening characteristic in a crash. The two materials work together offering excellent performance.