It works! Mostly... [SEP] I had to bump this from 4 to 3 stars.  After working a 12 hr shift they left something to be desired.  They mostly work but there were a few issues with fogging.  Still better with than without.<br /><br />***<br />Original Review:<br /><br />I'm practically blind without my glasses. And foggy lenses from having to wear a mask is almost as bad as not wearing my glasses.<br /><br />I wasn't very hopeful for these mask inserts but to my surprise they actually seem to work!  As long as I don't go jogging in them.  I did a test by blowing into the mask and it took some effort to get my glasses to build up a good fog. The real test will come tomorrow when I wear it to work.<br /><br />The only down side (so far) is a rubberized smell I'm hoping will disapaite with a good airing our.