- 1.Product:5 Pack Washable Reusable Black Cotton Mouth Cover，Unisex Breathing Valve Face Cover(Blue)
- 2.First layer of spunbond cloth filters micron-level dust; Second layer filters industrial pollutants, automobile exhaust, second-hand smoke, and pollen allergens.
- 3.Third layer of activated carbon cloth filters micron-level dust; Fourth layer offers filter density for smaller material.
- 4.Fifth layer of spunbond cloth filters out all kinds of harmful substances.
- 5.Note: 1. Filter insert can not be cleaned and should be replaced every 1-2 weeks. 2. When film or sticky sediment stains emerge, please replace the filter.
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