New, Unused Product Name: Double-Layer Knit Socks Size: 23-25cm Color: C-2 BL (Denim-style knit) Manufacturer: Koizumi Lifetex Co., Ltd. Made in Japan Heat Retention: Functions as two layers in one, providing excellent moisture retention and alleviating coldness. Comfort: Absorbs sweat and moisture, releasing it to the outside, preventing stuffiness and ensuring comfort. Materials: Outer: 70% Cotton, 29% Polyester, 1% Polyurethane Inner (Skin-side): 81% Silk, 18% Polyester, 1% Polyurethane