– lightweight, fast-drying performance-ready COOLmatic fabric and repreve recycled performance fiber. – UPF +40 protection on the brim, front panel and back panel. – machine washable. – pliable SOFTflat brim for easy packability. – reflective detailing for night run visibility. – ciele athletics™ million miles guarantee. – 5 panel fit. 58 cm. adjustable. one size fits most. – weight 62 grams. – designed for people who run.