The core function of wearing a cold-proof head covering for cycling is warmth retention and wind protection, while also providing protection and comfort. It can be specifically divided into three points: 1. Core warmth retention: It can cover heat-prone areas such as the head, ears, and neck, reducing heat loss caused by direct cold wind during cycling. It is especially suitable for low-temperature environments (such as autumn and winter) to prevent discomfort caused by cold on the head. 2. Wind protection: It blocks the oncoming cold wind from blowing into the collar or touching the face, reducing the stinging sensation on the face and ears caused by cold wind stimulation. At the same time, it can isolate dust and debris, protecting the respiratory tract from inhaling impurities. 3. Comfort improvement: The material of some cold-proof head coverings is breathable and does not trap sweat, which can prevent the head from catching cold after sweating during cycling. Moreover, it can be used as a helmet liner to reduce direct friction between the helmet and the head, improving comfort when wearing the helmet.