These replacement Snap-on/Snap-off Mounting Brackets for the ESS Innerzone 2. X-Tricator. FirePro-1977 EX and FirePro-1971 EX-2 are fully NFPA compliant and carry a lifetime warranty against manufacturers defects. These Snap-on/Snap-off mounting brackets attach to the brim of nearly any helmet. no drilling required. Once installed. the goggle straps can snap on and off of the helmet. allowing the user to store the goggles on the front or rear of the helmet. or store the goggles in a pocket when not being worn. This patented system is ideal for use in conjunction with faceshields or flipdowns.