【All-round heating to keep warm, reinforced support】: The boot-shaped design can warm the whole pair of feet, up to the calf. This can lock in heat and increase blood circulation, making the feet warm quickly. And the part of the boots has been reinforced. It will not cause it to slowly collapse or slip off, preventing cold air from entering the foot. The size is 11.8*10.2*7.8 inch, easy to wear without restriction, suitable for men and women.