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