It is said that human body temperature loss is related to three factors: low temperature, high humidity and strong wind. Loss of temperature is also graded. A specific standard of self-test is that if the thumb and little finger are out of contact, it indicates that the muscle has stopped working, which is one of the phenomena of transition from mild hypothermia to moderate hypothermia. According to this standard, there was a brief loss of temperature when swimming up in winter. Even many people have the feeling that their fingers are frozen. The problem is that this phenomenon is partial and short-lived. Covering your hands slows down. The key is the core part, chest, head, etc.
Better safe than sorry It’s useful to take a disposable raincoat for cycling or hiking. Of course, you can’t move in the trees. It will break. Just wear it between your coat and underwear.