LOVE, LOVE, LOVE these socks. They fit great, and actually stay where they are supposed to, on the HEEL.  I have worn them both with Toms and Chucks and they are completely hidden.  I wear a 7 women's size and these are the only socks that I have found that come small enough so they remain tight and do not fall into the shoe while wearing.  The company has the best customer service around as well.  I have ordered more and am sharing them with my daughter.