This is a Karrimor Thermal Crew, men's size M. I bought it in the fall of 2025 because I liked how light it was, but it was a little too big, so I'm selling it. It's labeled as size M, but I think it corresponds to a size L in Japan. I've added the official website's size chart in the third image, so please refer to it. Below is a quote from the official website: Thermal Crew A lightweight mid-layer that is useful all year round. Uses Octa®, a hollow fiber with 8 protrusions, which is half the weight of regular polyester fibers. It is highly elastic, traps dead air easily, and is made of an excellent material with heat retention, quick-drying properties, and antibacterial and deodorizing treatment. Useful in various scenes as activewear. Polygiene StayFresh™ throughout. *I keep pets indoors. Please be aware if you have allergies.