круглая площадь трехслойная non-woven air pad дышащий пыле рм2,5 маска с activate угольный фильтр водонепроницаемая маска сек plxu

round square three-layer non-woven air pad breathable dustproof waterproof mask s plxu.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.