1Natural herbal extract, not irritate the skin and care for your skin. 2Natural heat moxibustion plus far infrared heating to improve blood circulation and relieve pain. 3Self-heating materials, constant temperature heating, provide about 5 hours of continuous warmth. 4It is easy to carry, individual package is sanitary and convenient to use. 5The product can stick to the skin, strong viscosity, but not stick to clothes, health and environmental protection.