That's right. You just put a lid on it. Why? Because it is FREEZING out there.
Here are some interesting facts (cool facts on cold):
Head heat loss is usually less than one-third to one-fifth of total heat loss. That means it is not the majority, which would be more than 50%. Head heat loss is usually less than 20-30 percent or so of total heat loss.
Head heat loss changes with how cold it is. The lower the temperature, the higher percentage head heat loss. Head heat loss is linear with temperature. At 0 degrees Centigrade, up to about 30 to 35% of heat could be lost through your head at rest.
Head heat loss changes with how much you exercise. When exercising at about a work rate of 50% of aerobic capacity, head heat loss falls to less than half of heat loss at rest.
Head heat loss changes if you are in water compared to air.
The heat you lose from your head is small compared to the rest of your body. Some people have bigger heads than others in proportion to their stature, so maybe they can lose a percentage more heat. To reduce heat loss, wear a hat.