These are the best no-snow socks! They aren't paper thin (like others Ive tried), the heal doesnt slip off, and the toe seams don't rub on my little toe. I wear a womens size 10 and the medium socks fit great. They seemed a bit big the first time I wore them, but after one wash they fit perfect. They have also held up great to repeated washing. Definitely give these a try if you're looking for a great no-show sock!