Recommended for substance specific particle exposures up to 10x OSHA PEL for lead, cadmium, arsenic, and others. 3M™ Cool Flow™ Exhalation Valve is a 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.