81ch слоя 5 взрослых ребенок одноразовых колодок insert защитного коврик рот заменяемые сек рм2,5 маска pad pm2.5 mma3365 ткани лица

breathable face anti-dust saliva adjustable reusable replaceable valve mask with 2 disposable mask pad for pm2.5 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.