original 5 pads layer insert cigpt child protective mat mouth replaceable face mask activ m579

cigpt 5 layer child pads insert protective mat mouth replaceable famask black s pm2.5 dispo 8.1.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.