precision-engineered for the run. the FSTCapEthereal silhouette pushes technical performance with stretch TERRAstop ripstop woven fabric that forms to your head. carbon-embedded knits enhance moisture management, odor resistance, and durability, keeping you fresh through every mile. lightweight yet structured, this cap is built for endurance, with aerodynamic shaping and strategic ventilation for ultimate breathability. designed for those who demand more from their gear, because every detail counts.