The perfect add-on to your mask sealed in a 5 pack bag. Made of activated carbon and non-woven melt-blown filter cloth, four-layer filter system effectively keep away from PM 2.5 and a range of airborne contaminants. Good for up to 70 hours of use.
First layer of spunbond cloth filters micron-level dust;
Second layer filters industrial pollutants, automobile exhaust, second-hand smoke, and pollen allergens.
Third layer of activated carbon cloth filters micron-level dust;
Fourth layer offers filter density for smaller material.