Castelli Fast Feet 4 socks

Gain a critical edge with Castelli Fast Feet 4 Socks, born from the Fast Feet project for ultimate aerodynamics. Engineered with grooved Lycra® on the leg to detach airflow and a comfortable Rosso Corsa footbed, these socks save a proven 2 watts at 50 km/h. A polyurethane grip strip ensures a secure fit, keeping them perfectly in place without constriction. Experience the pinnacle of cycling sock innovation for maximum speed and comfort on race day