Made of cotton. This cap not only has a good sun-shading effect, but also there is a mini fan at the front of the brim. It is driven by solar energy, as long as there is sufficient sunlight, the fan will automatically start. Built-in solar power design, save energy, environmentally friendly and long lifespan, no battery required. The overall design is innovative and durable, focusing on reducing consumption and improving operational efficiency, occasionally dusting and cleaning it to maintain a smooth rotation
