Fibre-Metal P2HN Roughneck hard hat is fiberglass and will work at extreme temperatures up to 500ºF. The Fibre-Metal P2HN Roughneck is also performance rated with SEI third-party certified to meet ANSI Z89.1-2009 Type I Class G (and CSA Z94.1-2005 Type I Class G or C in both forward and reverse.