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OverviewFunction: 1. Keep the head warm. When people are in a relatively low temperature environment, they can wear hats to keep warm and increase the body temperature. 2. Head protection: In some cities with strong sandstorms, hats can be worn to resist the invasion of sandstorms and protect the head; In some workplaces, in order to prevent hair from getting entangled in the machine and causing scalp tearing, a hat is chosen to protect the head. 3. Physical sunscreen: In order to prevent skin damage caused by ultraviolet radiation, you can wear a hat outdoors to block ultraviolet radiation and avoid damage to human skin. Therefore, physical sunscreen should be applied. 4. Maintain cleanliness, such as in the catering industry, where chefs wear hats mainly to prevent hair from falling into food and contaminating it. In medical institutions, medical staff wear hats to prevent hair from falling into a sterile environment and contaminating the sterile area during medical procedures.