Most girls always have cold feet in winter. When heating, most people use small sun and heater to keep warm. However, in the process of using, it will be found that products generally suitable for individual use can only be used locally for heating, that is to say, either the front side of the lower leg is warm, the cold wind on the back side of the lower leg is swishing or the heater is swishing, and the foot plate is cold and cold. So how about adding a little careful thinking to the warm foot appliances to change this? The "J" shape incorporates two functional modules of warm air and electric heating wire heating, and the form follows the function to solve the problem of uneven local heating. Double-Heat brings warm experience to friends who are afraid of the cold.