... aluminum coating special nonwoven fabric is added, it is breathable and to some extend can protect you from the radio harm ... , odorless, breathable4) no stimulus to human kin5) filter pollen, dust and bacteria Specification:1) Material: 3 ply 30g PP + 20g filter +25 ... ISO9001 standard, very low resistance to breathing7) filter pollen, dust and bacteria [high filter and reflective] 17.5*9.5 face mask