Z-Tech Head & Neck Restraints need to be recertified every 5 years from the manufacture date stamped on the SFI label. (For example, if your Head & Neck Restraint is stamped January 2016, then it needs to be recertified in January 2021.) Is your Z-Tech Head & Neck Restraint due for Recertification? Don't worry, recertifying is easy, just follow the steps below: