based on the original specs that we started with over a decade ago, the GOCap Field uses our new COOLmatic | PLUS FLOWmesh™ on the top and side panels for maximum ventilation where you need it and our ROCstop ripstop for maximum durability and necessary + 50 UPF protection. our SOFTflat brim for long run comfort and easy, no stress packability. the iconic bar logo on the front is reflective for dusk through dawn lowlight runs. - lightweight, fast-drying performance-ready COOLmatic | PLUS™ recycled Repreve fabric. - UPF +40 protection on the brim front panel and back panel. - pliable SOFTflat brim for easy packability. - reflective detailing for night run visibility. - 5 panel fit. M/L 58 cm. adjustable. - weight 55 grams. - machine washable. - ciele athletics™ million miles guarantee. - designed for people who run. - main fabric: 100% recycled polyester. - secondary fabric: 95% recycled polyester 5% elastane