Unused Functionality: Functions as two layers in one (heat retention and sweat absorption), allowing you to stay warm and comfortable even if you dislike wearing multiple layers. It absorbs sweat and moisture and releases it to the outside, making it less likely to get stuffy. Uses: Can be used not only at home but also when going out, as the design doesn't interfere with your outfit, making it suitable for various situations. Material (Denim-style knit/Border): Outer: 65% Cotton, 31% Polyester, 4% Polyurethane Inner: 80% Silk, 18% Polyester, 2% Polyurethane Size: 23-25cm Manufacturer: Koizumi Lifetec Co., Ltd. Country of Origin: Made in Japan Gender: Women's