【Effective Sun Protection】Stay shielded from harmful rays with our outdoor sun hat featuring a dual-fan design for optimal ventilation and cooling. 【One Size Fit All】Our Solar Fan Hat features a rear elastic drawstring, ensuring a snug fit for both men and women with head sizes ranging from 22″ to 23.6″. 【Dual Power Supply Fan System】Equipped with two battery-powered solar fans, this hat offers versatile charging options through outdoor solar or USB. 【Comfort and Breathability】Crafted from 100% polyester, this hat offers effective moisture-wicking properties and a water-resistant surface with a sweatband. The mesh layer on top enhances airflow. 【Versatile Outdoor Companion】Ideal for golfing, hiking, running, cycling, fishing, or beach outings.