Three stars for possible effectiveness (I mean, really, who knows), but have to be the most uncomfortable masks ever. No matter how much I try to stretch the elastics they are very uncomfortable to wear. Ugh.
Response from 3m.comBy PSD Support, February 2, 2022
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I work in a school setting and have a very high exposure to all of the students and staff. I am exposed at times to body fluids, chlorine, and other cleaning agent gases, There are also a lot of odors and fluids from trash (food, etc.). I have had confidence in this mask, which has blocked particles that come from all of the items I mentioned above. The mask has a snug fit, and there is room to breathe. Two straps make it hold securely, and the nose clip is adjustable and does not allow air to fog glasses.
A few reviewers did not care for the rubber bands that serve as security straps. There are times they will catch on my hair, but I have not experienced any breakage and they are easy to keep clean as I go through the day.