This is a far-infrared supporter (2 pieces for ankles). Key features are as follows: Material: Composed of 60% acrylic, 15% wool, 15% polyester, 5% nylon, and 5% polyurethane. Suitable size: Fits ankles up to 30cm in circumference. Function: Uses fibers infused with binchotan charcoal, which is said to emit far-infrared rays, gently warming the ankle area. Made in Japan. Features: The skin-facing side is made of silk for a comfortable feel and a design that prevents stuffiness. The top and bottom openings are ribbed for a good fit and to prevent slipping. Although it is new and unused, it has been stored at home. Thank you for your understanding. Thank you for looking.