♥Built-in solar sun power design, save energy, environmentally friendly and long lifespan, no battery required. Save our earth, use of green power solar energy and turn the fan on. ♥Solar powered fan that cools your face off in the sun, unique magic sticker design, make you easy adjust size to match you need. ♥This cap made of cotton material, it is durable, breathable, comfortable and lightweight. ♥Suitable for: traveling, fishing, climbing, playing golf, gathering at plaza, or watching drama, watching ball game and other outdoor activities.