I have bought many socks looking for the perfect pair and this is it!  I have worn them with 2 different pairs of tennis shoes and a pair of slip on shoes all day, and not once did the sock move. They come up far enough on the top of your foot to stay in place but not so far that you can't wear the slip ons that are so popular these days. The back has a little rubber strip to keep it in place on your heel but it doesn't bother you at all. They are thin, but I prefer that.  It's like you aren't wearing anything at all. These are worth every penny and if I could give them 10 stars I would.