Ciele FSTCap Ethereal Icon Circle C – Shadowcast is a premium performance running cap precision-engineered for speed, endurance, and lightweight comfort. Constructed from stretch TERRAstop ripstop woven fabric, it conforms naturally to your head for a secure, streamlined fit without sacrificing flexibility. Carbon-embedded knit panels enhance moisture management, improve odour resistance, and increase long-term durability, helping you stay cool and fresh through every mile. Its aerodynamic silhouette and strategically placed ventilation maximize airflow while maintaining a lightweight, structured feel for distraction-free performance. Finished in the Shadowcast colorway with the signature Circle C logo, the FSTCap Ethereal is built for runners who demand cutting-edge technology and uncompromising comfort on every run.