Weird smell, but great for dry eyes. [SEP] I have to sleep with a sleep mask on every night because I sleep with my eyes open and they get dried out. These have a little puffy lip on the inside that sits right on top of your eyelid, and therefore keep your eyes closed.  So I would highly recommend these to anyone who sleeps with their eyes open!  They do have a really weird, chemical smell to them.  They're supposed to have a 'calming' smell, but honestly it is just sickening.  I leave them out of the package for about a week before I actually sleep with them to let them air out; it helps tremendously. Once you get rid of the smell, they're great.  Also, the elastic does stretch after a while, but it does that on any sleep mask and it's usually time to replace it at that point anyway.