They don't stop a virus, that's not what they're made for. However, if you're looking for something to cover the face to keep your work off the tail, this is the choice. It is easy to breathe, comfortable to wear, and does not cause discomfort like ear straps or mask straps. We ordered both Heather Black and Heather Gray. I only gave 4 stars for comfort because I really dislike covering my face and not because of the product.
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