Filters pm2.5, pm10, dust, and allergens with the Ffp2 mask, which is equal to the N95 pollution mask. The mask has a flat fold that makes it easy to transport; Precautions: Before using, read the label carefully. Keep your distance from the kids; Misuse of this respirator can lead to work-related sickness. Store in a cool, dry location. 3m Exhalation valve with a cool flow to prevent heat and carbon dioxide build-up.