Being a day sleeper, it is really important to have a mask that blocks out all daylight filtering into the bedroom. I've had a few other sleep masks that I wasn't really satisfied with. They would slip down, or wouldn't filter all light out. My wife loved her scarf that I bought from here, so I figured I would try out one of these masks. It is hands-down the best sleep mask I have ever owned. It fits snugly and completely blocks daylight. I can't be sure that the band around it won't stretch, but so far, it has given me a few days of deep, uninterrupted sleep.