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 are 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 are great also the elastic does stretch after a while but it does that on any sleep mask and it is usually time to replace it at that point anyway