This Health Care sock is 100% brand new & high quality. It made of high-quality polyester cotton with the characteristics of soft and comfortable. The bottom of socks has Tourmaline design which can self-heating to warm and relax your feet in cold weather. These tourmaline socks relieve leg fatigue, pain, regulate the nervous system, self-heating, remove moisture and stop odor remove swelling of the legs and feet peeling of the skin, produce a static foot massage, regulate blood flow. It is great for outdoor activities: skiing, snowboarding, hiking, hockey, and other sports.