Dust mask replacement filter material: Non-woven, Active Charcoal cloth. Compatible with majority of Dust Masks available in the market PM 2.5, best to protectyour mouth and face from Dust, Haze, Germs, Allergies, Smoke, Pollution, Ash, Pollen, Gardening, Crafts, etc.
Five Layer Protection: 1st layer of spunbond cloth filters micron-level dust. 2nd layer filters industrial pollutants, automobile exhaust, passive smoking, and pollen allergens. 3rd layer of active carbon cloth filters micron-level dust. 4th layer offers filter density for smaller material. 5th layer of spunbond cloth filters out all kinds of harmful substances.