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. Features 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. Fabrics Main fabric: 100% recycled polyester. Secondary fabric: 95% recycled polyester 5% elastane