Originally I was not sure about these, because I had never seen them before. I really like them! They snap onto your ear, and they do help to keep your ears pleasantly warm. They do not mess up my hair, even when it is in an updo. They are small and light, and fit in my purse easily. There are two things that went into my consideration to gave them 4 stars instead of 5. The first is that if you forget that you are wearing them and try to put your hair behind your ear they kind of shoot off,  or at least they do for me. The second reason is that although they are warm for a cool day, I don't believe that they would work really well if it were really cold. All in all, I would buy them again.