... comfortable, odorless, breathable4) no stimulus to human kin5) filter pollen, dust and bacteria Specification:1) Material: 3 ply 20/25g PP ... + 20/25g filter +20/25 g2) Size :175*95/ ... with CE,ISO9001 standards, very low resistance to breathing7) filter pollen, dust and bacteriauitable for garden work, house cleaning, laboratories, factories ...