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-301 does not include a visor or faceseal. The M-301 hardhat does not include a visor or faceseal, allowing the customer to choose the exact combination that meets their needs.