I wouldn't wear these if you need "serious" protection, they are listed as non-medical and I have to agree (shame ) . I was able to wear one of these comfortably for 8 hours in the office and an 18 hour travel day with no issues. Depending on the mask, my ears usually screech after 4-6 hours and with these they didn't chirp even after an 18+ hour day. They are very cute and have received many compliments. I'm very glad I bought it and was tempted to buy another set just in case, although the one I have (50 masks) will probably last a while.
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