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-305 assembly includes a standard visor and standard faceseal. The M-305 assembly includes a M-925 Visor and M-935 Faceseal. The M-925 visor is made of polycarbonate. The M-935 faceseal is appropriate for general purpose use.