Final answer:
Wearing headgear in cold weather is important to prevent rapid heat loss from the body and help retain heat.
Step-by-step explanation:
In cold weather, it is important to wear headgear to prevent rapid heat loss from the body. The head is a significant source of heat loss as it contains a large number of blood vessels close to the surface of the skin. By wearing headgear, such as a hat or earmuffs, the body can retain heat and stay warm.