I've worn this for about two months. IKIHADAGI is a domestic, long-established underwear manufacturer. They offer products made with a commitment to being made in Japan. The following is an excerpt from their website: (Reference URL: https://www.as-ya.jp/c/orijinaru/iki/10-4208-68-10) Woven with a unique knitting method that incorporates more air than usual, thanks to the craftsmanship, it features warmth more than three times that of a regular garment and a light, feathery feel. It's knitted with a "meriyasu" (jersey) weave that has no seams at the sides, and the brushed finish of the meriyasu is a rare technique that only one dyeing factory in the country can do. Material Points: The skin side is heavily brushed, providing warmth from the moment you put it on. It fits comfortably with a soft stretch that doesn't feel constricting. With a heathered look that resembles a sweatshirt, it's also recommended for loungewear. --- ❤︎ I will ship within 24 hours. ❤︎ I have many other items for sale, so please take a look. ❤︎ Please feel free to ask any questions in the comments. ❤︎❤︎ I am also using other sites, so I may remove the listing without notice. Thank you for your understanding.