Zamp Head and Neck Restraint Z-Tech Series 6AModel: Z Tech Series 6A Head and Neck Restraint The new Series 6A has new features never seen before in the Head and Neck Restraint market. These new Patent Pending Features include: HIGH Back provides more natural pull angle and easier side to side movement Advanced Axis Adjustment allows you to adjust shoulder width, arm angle and arm width. Fits different body shapes and sizes through adjustments and works for different race seat configurations