The self-heating insole itself does not generate heat, mainly because of the special physical properties of tourmaline (a mineral tourmaline or tourmaline), which can permanently generate micro-current, similar to the current of human nerves, thus promoting smooth blood circulation, releasing negative ions, regulating the ion balance of human body, relaxing body and mind, activating cells, improving self-healing rate, etc., and inhibiting oxidation of the body and removing odor. Its foot pad releases a large number of far infrared rays and negative ions which are beneficial to human health, thus achieving the functions of accelerating blood circulation of the foot, promoting metabolism, and improving the internal environment and rhythmic nerves of the foot. The product can effectively treat beriberi and foot odor, leg cramps, toe cysts, corns and calluses, heel pain and other diseases. After the self-heating insole directly touches the sole of the foot for ten or twenty minutes, it will feel burning, which is a bit like the feeling of putting pepper. Wearing socks will feel slower. In short, it is very good and can improve sweaty feet for a long time.