Thank you for viewing. This is a high-performance base layer from Patagonia, the Capilene Midweight. I purchased it in the US a few years ago, but it has been stored without being worn. It's a US size S, which I believe is equivalent to a Japanese size M. It has a Patagonia tag on the hem and elastic cuffs. ◼️Product Information • Brand: Patagonia • Model: Capilene Midweight • Color: Black • Size: S • Condition: New, unused with tags ◼️Features • Midweight type of the Capilene series, excellent in moisture wicking and quick drying. • Good balance of breathability and warmth, ideal for various outdoor activities such as mountain climbing, trail running, and skiing. ◼️Notes • Although it is new with tags, please purchase only if you understand that it has been stored at home.