I got this tape to try out on my face mask. I wear glasses and get them fogged up terrible, and thought I would try this tape. I put it on the inside top of the mask all the way across and it does an incredible job! No fogging! The only drawback I see is you can’t remove your mask too often or you have to reapply the tape. So I recommend you people with glasses who are wearing face masks cause of the covid virus, try it!