Castelli Fast Feet 4 Socks The Castelli Fast Feet 4 Cycling Socks are designed for cyclists seeking maximum aerodynamic performance without compromising comfort. Part of Castelli's Fast Feet project, these socks feature a foot section based on the Rosso Corsa Sock, providing all-day in-shoe comfort, while a polyurethane grip strip at the top keeps them securely in place. The leg portion is crafted from engineered, grooved Lycra® that optimises airflow, reducing drag and enhancing speed on every ride. Lightweight, performance-focused, and race-ready, the Fast Feet 4 Socks are a must-have for...