Used with an approved air source, M-300 Series hardhats provide respiratory (OSHA APF=25) and limited head (ANSI Z89.1-2003 Type 1 Class G) and eye (ANSI Z87.1-2010) protection. The M-307 assembly includes a premium visor and premium faceseal. The M-307 assembly includes a M-927 Visor and M-937 Faceseal. The M-927 visor is made of coated polycarbonate. The M-937 faceseal is made of flame resistant polyester.