... 2.Latex-free synthetic rubber head strap. Safety Respirator,Face Mask, Dust Respirator,Protective Mask Features1. Conforms to international standards: EN149: ... 1716: 1994 NIOSH N95. Low breathing resistance with high filtration efficiency. Loaded polypropylene material without any toxic, ... sizes. 3. special 3-ply pleated design, high filtration and static electricity material to resist normal toxic ...