The media could not be loaded.These masks work exactly as advertised and are certified as they should be (to some of the highest standards). I am immunocompromised and have worn these masks anytime I’m indoors with more than a few people. They are more than worth the value for peace of mind (just be sure the seal is solid and air isn’t leaking so you get the full protection). The filter does make a little noise when you breathe if it’s working right; I can see that being an issue for some, but I got used to it (nobody else notices it). The thing I don’t like is the shiny surface on the vent. I went with this listing specifically because it shows them as a solid white color, yet I ended up with the flashy ones (again). It’s not harmful, obviously, I just don’t get why they needed to add this, and I wish the listing had shown proper images of that. I also think the masks are on the smaller side. Though they fit me perfectly and cover my face, a bigger man or larger-faced person might not find these comfortable.The masks are thin and lightweight with a good fit. I am able to wear them for a long time without issue. The masks also fit. Obviously, if you need to protect more than yourself or you are the ill one, these won’t help. If you’re looking for self-protection in any setting. These are perfect.