This 3M N95 mask helps to filter out fine airborne particles including pollens, dander, mite allergen, mold spores, and microorganisms by using advanced electrostatically charged microfibers. The patented Black 3M Cool Flow one-way valve offers easy exhalation for cooler, dry comfort. A special M-Noseclip adjusts easily for fewer pressure points, gives greater comfort and helps provide a secure seal. This mask can be worn for long periods of time until it becomes damaged, soiled, or breathing becomes difficult. NIOSH government-approved N95 Respirator provides at least 95% filtration against non-oil particles.