... soft, comfortable, odorless, breathable4) no stimulus to human kin5) filter pollen, dust and bacteria Specification:1) Material: 3 ply 30g PP + 20g ... filter +25 g2) Size :175*95/90mm (for adult) ... with ISO9001 standard, very low resistance to breathing7) filter pollen, dust and bacteria [high filter and reflective] 17.5*9.5 face mask