Our Self-Heating Socks contain high quality polyester fiber. It can stimulate the acupoints on the soles of the feet, accelerate blood circulation throughout the body, help increase body energy, and strengthen the body. The way to use it is simple: clean and dry your feet, put the product on your feet, and then go about your daily activities as usual. After putting on thermal socks, you can put on ordinary socks and shoes as needed. It can generate mild heat for a long time and solve the problem of cold feet.