Adjustable size ensures comfort wear, making this rechargeable solar sun hat a multiuse head accessory for group adventures or individual use Keep cool outdoor with this solar power fan hat with builtin 300mAh battery for longlasting use, great for extended sun exposure Light weighing polyester fabric enhances breathability, while the temperature sensitive fan with automatically 3 adjust speed for fishing trip, gardening, and family outings under intense sunlight condition Design for hikers, golfers, and outdoor workers needing head cooling during prolonged activity