With low-profile frames and anti-fog lenses, ESS FirePro-1971 structural firefighting goggles are the most advanced on the market. This goggle series is compliant with NFPA 1971-2013 Edition, including the 5-minute, 500-degree F oven test. It is also U.S. Federal OSHA compliant, exceeds the requirements of ANSI Z87.1-2015, and is considered Primary Eye Protection by NFPA 1500. All components of ESS FirePro-1971 goggles are heat and flame resistant. The FirePro-1971 EX-1 model features a two-piece strap with semi-permanent mounting brackets that easily secure to brimmed helmets, no drilling required.