Recommended for substance specific particle exposures up to 10x OSHA PEL for lead cadmium arsenic and others. 3M™Cool Flow™Exhalation Valve is a patented one-way valve offering easy exhalation for cool dry comfort. Faceseal is comfortable to wear and contours easily to help provide a good seal. Adjustable noseclip provides a custom fit secure seal and reduces the potential for eyewear fogging. Lightweight construction contributes to increased wear time. Buckle adjustable straps provide a comfortable secure fit with a single tug