These are by far the most uncomfortable masks I have ever seen.
We rent these out along with the HeadCase.
Luckily, we have very few of the X-Rays and I usually give people the HeadCase models instead.
It saves me the the trouble of exchanging them later and having to clean even more dirty masks.
Don't buy these!
Don't get these for your business, you will have a never ending stream of complaints about them.