I usually use it for winter wearing. I am wearing it on double thin socks on ordinary thin socks. By the way, this is Hokkaido. Although it is about warmth, it is pleasant without problems at all by wearing this cold shoes and walking outside. Since I came to think seriously about energy saving since 3.11 in the room, I have kept heating use in winter to a minimum, and the inside of the room is quite cold. In such an environment, this socks alone is not enough, so it is necessary to use it together with what is called a separate oversock or room shoes for the room. If you think that you can do with socks alone, it is expensive but I think that a full-fledged product for winter mountaineering is better. Durability (hole difficulty) is excellent and it is pretty strong. Also at the same time I tried to purchase "cold weather pile socks (plain 2P)", although the cold weather was also good there, but the price was markedly inexpensive, clearly inferior in terms of durability.