Not really happy with these
I found these very difficult to keep in place.  I don't know if I'm doing something wrong or what.  But I place the cover on the mask, where it is meant to be, by but the time I get the mask hooked up, the cover is not where it should be, it's slipped out of alignment.  I gave up trying and have put them aside.  I didn't return them because if I'm in a pinch, and need something, they might help a little.  But I do hope I never come to need them.  The cloth is very soft but keeping them in place is another matter.
Rating: 2 stars