клапан дыхательной маски для взрослых anti-dust регулируемых детей взрослый рм2,5 многоразовый рот муфельного с 2 одноразовой маской pad cca

breathing valve mask anti-dust adjustable kids adult pm2.5 reusable mouth muffle with 2 disposable mask pad cca12023 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