Sun Hat UV Protection: Cooltto fishing hat has a UPF 50+ sun protection rating, which blocks 98% of harmful UVA and UVB rays. The 12 cm long brim protects your neck, ears, and face from harmful rays. The waterproof polyester fabric is perfect for outdoor use. Quick-drying fabric, no fear of rain and fog. .Adjustable Sun Hat: Cooltto summer hat for men features a head circumference adjustment buckle design, allowing you to adjust the head circumference size as desired, suitable for adults with a head circumference of 59-61 cm. There are buttons on both sides of the hat, and the buttons can be folded left and right to create a cowboy style. .Breathable Sun Hat: The men's sun hat is made of 100% polyester with double stitching for durability. Honeycomb-shaped ventilation openings on the sides of the fishing hat keep your head cool and comfortable. The adjustable elastic chin strap keeps the hat in place, so you don't have to worry about it blowing off when the wind blows. The integrated sweatband wicks sweat away from your eyes and face. .Foldable Sun Hat for Men: Cooltto fishing hat for men is lightweight and portable; its 145g weight will never weigh you down. You can easily fold it and put it in any handbag, backpack, or pocket.