1. Meeting the international quality criteria(Europe): EN149: 2001, 2. Made with muliti-layerde nonpoisonous, non-allergic, non-stimulationg materials. 3. Adjust the bandage strip and the built-in bandage foam cushion to adapt to various face-shapes with comfortable sealing. Special design, The breath is more relaxed; 4, the high-efficient and strong electrostatic filtering materials effectively filter the solid particle dust, and prevent the oil liquid gas; 5. The breather valve makes your breath easy by reducing heat accumulation. 6, use for construction, mining, textile, grinding medicine, disintegration projects, agriculture and animal husbandry, cutting dust, pollutes from heavy metal.