20 40 80 professional reptaceable 3-layer mask pad анти рм2,5 сменный фильтр загрязнения дышите свободно для взрослых dadily жизни

20 40 80 professional reptaceable 3-layer mask pad anti pollution breathe freely for adults dadily life features: 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.