As a dentist I have used many thousands of identical looking face-masks, but unfortunately this Amazon-mask is a disappointment because the elastic keep coming off. I had to hide in a supermarket aisle while trying to punch a hole in the mask-corner with a key so I could tie the suddenly flagging loose end through it. I now carry spares because this has happened several times. The elastic ear-loops are heat-welded to the mask and the "weld" fail. As I said, in my experience, this is a unique and frequent point of failure for this mask.