1. First layer of spun-bonded cloth filters micron-level dust
2. Second layer filters industrial pollutants, automobile exhaust, second-hand smoke, and pollen allergens
3. Third layer of activated carbon cloth filters micron-level dust
4. Fourth layer offers filter density for smaller material
5. Fifth layer of spun-bonded cloth filters out all kinds of harmful substances
Package includes:
1 x 5 layer replacement Filters for 2 valve sport masks