2) With multi-layered nonpoisonous, non-allergic, non-stimulating materials.

3) Adjust the bandage strip and the built-in bandage foam cushion to adapt to various  face-shapes with comfortable sealing.
4) The high-efficient and strong electrostatic filtering materials effectively filter  the solid particle dust, and prevent the oil liquid gas.

5) Use for construction, mining, textile, grinding medicine, disintegration projects,
agriculture and animal husbandry, cutting dust, pollutes from heavy metal.