dhl shipwomen man dustproof anti pollution full mouth breath washable reusable muffle protective with dust mask pm2.5 activate carbon

women man dustproof anti dust pollution full mouth breath washable reusable muffle protective with 10 pad e.1.the first layer: high efficient filter cloth filter the dust of micron.2.the second layer: meltblown cloth to filter industrial pollutants, automobile exhaust, second-hand smoke pollen allergies.3.the third layer: high efficient filter cloth filter benzene and a smaller function of filtering dust microns.4.the fourth layer: activated carbon cloth filter density, sma.