HEAT AND YOUR HEAD
It’s a myth that humans lose most of their heat through their heads. You only give off about
10% of your heat through your head, and mostly because it has so many small blood vessels running close to your scalp. But because the blood is being cooled and then returning to your body, not wearing a hat can make quite a difference to your temperature. Interestingly, a cold head won’t induce shivering, so it’s often difficult to sense when you’re losing heat that way.