Comfortable material will not rub your face, offering great softness. Perfect for everyday use or outdoor activities, fashionable and breathable to wear. Protects you from dust, pollen, cold, smog, vehicle exhaust and sandy air. Adjustable Strip. It makes it easy to adjust the rope length. Comes with one dust cover and 30 pcs filters. The dust cover is not medical grade masks. Note: Reusable and washable duct cover. You can insert the mask filter along the opening in the mask.