Castelli Fast Feet 4 Sock Black, L/XL
- BackcountryBrand site20% off through Tuesday$65Buy
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From Backcountry
What Our Gearhead® Experts Are Saying:"I wear the Fast Feet 4 Sock on race day or whenever I’m chasing every second. The aero fabric feels fast, and the footbed fits like a Rosso Corsa—tight, supportive, and super breathable. They stay in place all ride thanks to the grippy cuff."When every second counts, we slip into the Fast Feet 4 Sock. Part of Castelli’s Fast Feet project, this sock is built to reduce drag where it matters most—on the leading edge of every pedal stroke. Engineered Lycra® up top features vertical grooves that help detach airflow, while the polyurethane grip at the cuff keeps the sock locked in place at high speed.
