Features 1. Tourmaline Physiotherapy: The self-heating principle of the tourmaline at the bottom, with mild heat, and has a warming effect on the feeling of cold feet. 2. Humanized Close Design: The self-heating socks are humanized foot-fitting design, fits the foot curve, making the hot spots close to the sole skin. 3. Promote Blood Circulation: The self-heating socks can massage acupuncture points on the feet to regulate the nervous system and promote blood circulation. 4. Comfortable and Breathable: The self-heating socks using high-quality polyester cotton, soft and comfortable, long service life. One size fits most men, women, or teenagers. 5. Widely Used: The self-heating socks are suitable for outdoor activities: skiing, snowboarding, hiking, hockey, camping hiking, riding motorcycles, etc. Specification Material: Cotton blend Color: Black, Red, White Package Size: 21 15 3 cm Weight: 38 g Package Include: 1 Pair Self-Heating Socks