*Three layers of protection for effective filtering *Outer layer: non-woven material, inhibits dust and dust from degrading harmful substances *Middle layer: Melt-blown electrostatic micro-filtration layer, efficient filtration, isolation of fine particles from dust, droplets, etc., protection rate of 90% -95% *Inner layer: ultra-fine soft fiber, skin-friendly thickening and moisture-proof *Elasticity on both sides effectively reduces ear pressure *Better protection in smog, public places, and
offices *Main ingredients: Meltblown cloth and non-woven cloth 3 layers