The Castelli Fast Feet 2 Socks are designed to give you the aerodynamic edge of a time trial shoecover when race regulations or conditions call for socks instead. Developed as part of Castellis Fast Feet project, they help save watts while keeping you cool in warm weather.

Inspired by Race-Day Performance: Built for road racing and high-speed efforts, these socks use engineered materials to manage airflow. The grooved Lycra leg construction reduces drag by helping detach airflow, giving you smoother performance through the wind.

Comfort from the Ground Up: The foot portion of the Fast Feet 2 is based on Castellis proven Rosso Corsa Sock. With a snug fit and breathable fabric, it delivers excellent in-shoe comfort, ensuring your focus stays on power and cadence rather than on your feet.

Built for Speed and Style: Blending cutting-edge aerodynamics with Castellis signature race-day design, the Fast Feet 2 Socks are the perfect addition for riders chasing marginal gains. Whether sprinting for the finish or pushing through solo efforts, these socks are built to perform.

A polyurethane grip strip at the top of the sock keeps it securely in place, even during long races and hard accelerations. This ensures a distraction-free ride, allowing you to stay fully locked into your performance.