Virrat (Streams) sock pattern was exclusive to the registered racers of Tour-de-Sock 2015 until the end of January 2016. It was the pattern of the first stage starting June 1st, 2015. The pattern is now available for everyone free of charge.
Ravelry: Priha pattern by Tiina Kuu
Little Dragon Socks are made from the toe up with a backwards Dutch (or horseshoe) heel.