Not what I expected
I thought they would be bigger and fit my face better.  I thought that they would allow me to breathe better when using a mask.  They come with clips on the sided that are supposed to slip into the folds of a mask, but they don't stay there unless you want to tape them into place .  Because they are plastic, they make you sweat.  They say they are adult sized, but they might be better for kids.  Try something else - these were not that great.  I would not buy them again.
Rating: 2 stars