I really wanted to love these socks. But I wore them around the house briefly and found that they irritated my Achilles tendons. They were red after I took the socks off. It could be just me, as I have heels that stick out so my Achilles tendons are more exposed than for people with heels more in line with their ankles. I got a small and I wear a size 7 street shoe. The socks seem to fit fine otherwise.