I’ve bought several face masks from various sources trying to find one I can tolerate. They’re either too tight or too thick... they just don’t fit right and/or they’re hard to breathe in.. I thought I’d try this one too, since it was relatively inexpensive. I bought a Large, hoping it would be big enough to stay on my ears and allow me to breathe through it. I was very happy when I received it and found that it was, in fact, large enough to stay on my ears, yet allowed me to breath comfortably! I ordered 3 more and they arrived today! I’m a satisfied customer and highly recommend these masks!