Cooling Function: Built as a solar fan cap, it helps create a more comfortable feel on hot days by using solar power to support the fan, making it useful for travel, sports, camping, and beach outings. Product Type: This solar charging cap lightweight piece of headwear designed as a sporty baseball cap and mesh cap for outdoor wear, combining a casual look with practical sun protection. Solar Charging Design: The solar charging cap features a built-in sunlight collector and a USB charging port, giving you flexible power options so the fan can keep working in daylight or when recharged in beforehand Comfort Features: The breathable mesh cap construction and customizable sizing help the hat sit securely while allowing ventilation, which makes it easier to wear for long hours without feeling overly heavy or stuffy.