This is a M size Washio Mochihada long shirt. I purchased this here, but after trying it on at home, I didn't use it, so I'm putting it up for sale. It's very warm to wear. Just wearing a regular sweater over this would probably be warm enough to withstand even the coldest places. I was going to go to a Scandinavian country for work and was expecting negative temperatures, but I ended up not actually using it, so I'm selling it. Please note that the inner packaging has been removed, so the original plastic wrapping is not included. It's only been tried on, so it's in near-new condition.