Fast Feet 4 Sock Size:S/M Maple provides a considerable dose

Maple provides a considerable dose of carbohydrates that are easily metabolized to glucose during training

Terra Artica GTX is fully waterproof

Aeris is equipped with a revolutionary rail insertion that provides a more aero feeling by allowing for a broad range of adjustability

Ergonomic Support: Increases arm wrap and surface area for a more comfortable ride

the grip texture

Fast Feet 4 Sock Size:S/M Maple provides a considerable doseNew Arrival Spring 2026 Castelli's Fast Feet project for maximum aerodynamics. Foot portion based on Castelli Rosso Corsa Sock for in shoe comfort. Polyurethane grip strip at top to keep sock in place Leg portion constructed with engineered grooved Lycra to help detach airflow