Hiking, trail running 90% polyester, 10% spandex Lightweight, water-repellent and quick-drying UPF40+ fabric for different weather conditions Foldable brim allows easy packing Sweatband is treated with advanced silver ion odor control technology, which not only eliminates odor but also prevents the growth of bacteria Adjustable string and buckle at back for various head circumference Glasses holes on both sides Reflective design for night visibility Size: F(53cm)