These four face masks can be placed over a K95 mask or other good mask when you are in an enclosed space with many strangers, some of whom may have repository diseases that could spread to you. Even alone without a more protective mask underneath, these masks will reduce virus inoculum volume, and thus improve your immune system's chances of beating off colds, flu, and related diseases. As solid-colored masks are boring and have connotations that remind us of hospitals and disease, I think it’s nice to cover them with something more colorful and cheerful.
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