3 слоя mouth mask прокладка хлопок сердечника сменная дышащий рм2,5 активировать угольный фильтр маски рот изоляция pad против пыли и дымки

3 layers mouth mask gasket cotton core replaceable breathable isolation pad anti dust and haze mask mat b1.1.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.