saliva dhl dustproof shipbreathable mouth dust protective anti fawith 2 mask pm2.5 activat6np1

breathable mask protective anti dust saliva mouth mask dustproof pm2.5 fawith 2 mask pad z.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.