Hard hats will protect your head, but that still leaves your face pretty vulnerable unless you get the Hard Hat Face Mask! The men's hard hat face mask attaches to the separately sold hard hat liner. The 4.5 oz. outer shell is flame resistant as well as the 10 oz. insulation. Shell is 93% Nomex® Aramid / 5% Kevlar® Aramid / 2% other fiber. HRC rated 4. This is a great product for construction or utility workers. Give a little added protection to some of your most valuable features with the hard hat face mask!