I was looking for socks similar to these made by adias that I was during 2 3 day 60 mile Breast Cancer walks.  They were the best socks I had ever wore.  I couldn't find them anymore (I guess because it has beem 6 & 8 years ago) but these may be the update to those socks. They feel wonderful on and never slide down inside my shoe.  They are tight enough to stay put but do not leave impressions on my ankles either.  They wash up nicely and do not shrink.  Now that I found them, I will have to stock up.