It is made of safe plastic and flocking. It is safe and stable. It will not hurt the head under heavy pressure. A breathable empty hat design is adopted to achieve comfortable breathable, light and cool effect. The cap band can adjust the tightness according to the size of the head, feel flexible, safe and stable, it is very convenient to adjust. Solar energy is directly converted into electric energy to turn the fan. Without installing batteries, the fan will store electricity when there is sunlight, and the fan can be driven by the stored electricity even when there is no sunlight.