Innovative respirators from 3M feature patented technologies. The N95 classification means 95% of particles down to 0.3 microns are screened out. Observe manufacturer recommendations regarding usage. Features: Cool Flow Exhalation Valve-Patented one-way valve for easy exhalation and cool, dry comfort. M-Noseclip - Adjusts easily for fewer pressure points and greater comfort. Electret Media - Advanced electrostatically charged microfibers help make breathing easier and cooler.