The Yak Yarnery Yakety Yak Sock
Yakety Yak Sock will take it up a notch if you are looking for a bit more warmth. Yak wool is 30% warmer then merino so I've added just enough that you won't overheat but will be oh so cozy.
70% Superwash Merino, 20% Yak, 10% Nylon
3 ply yarn Superwash