Made of high-quality polyester cotton with the characteristics of soft and comfortable, has a long life.The bottom of socks has Tourmaline design which can self-heating to warm and your feet in cold weather. ??Tourmaline socks relieve leg fatigue, pain, regulate the nervous system, self-heating, and stop odor swelling of the legs and feet peeling of the skin, produce a static foot massage, regulate blood flow. ??The perfect tool for legs with varicose veins, as well as in renal failure. therapy for the ankles and feet when frostbite.To stimulate acupuncture points. Daily use any time of day. Wash under running warm water without detergents. ??Great for outdoor activities: skiing, snowboarding, hiking, and other sports