dhl activate shipdouble double carbon single breathable filter pm2.5 valve air pad dust m e46l

double valve breathable mask single double valve air pad dust mask reusable anti-dust pm2.5 protective fagga3333 y.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.