Simpson Hybrid S Head And Neck RestraintThe Simpson (formerly Safety Solutions) Hybrid S Head and Neck Restraint is not only FIA & SFI approved for competition use with standard racing harnesses, but has also been tested and shown to be compatible with standard 3 point safety belts as found in street vehicles. Partnering with auto manufacturers in Detroit, the carbon fiber Hybrid S has been third party tested using the same FMVSS208 procedure as found on other head and neck restraints. When