These cold-weather bands, made by TEIJIN, promote circulation by warming the wrists and ankles. - Product Name: Hietorikun - Size: M [Hietori Band NEW Hietorikun] Set of 2, for hands and feet, far infrared, TEIJIN material, measures against coldness, warming activity, ankles, wrists, warm goods, copper fiber, deep-sea minerals, Hietorikun ・Recommended for those who: Are suffering from coldness Want to take care of their body Do standing work Play sports Do desk work ■Quality Indication Surface: 100% Nylon Filling: 100% Polyester (TEIJIN Warmal) Lining: 58.8% Polyester, 41.2% Copper Thread