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    For road racing or when you can't wear a Fast Feet TT Shoecover, this sock saves watts.

    There are lots of so-called aero socks out there. But the Castelli Fast Feet has the development and testing to back up the claim. The few socks that have been tested have probably been tested with a static, non-moving test because it's easier. But a foot is always in motion, so we created a jig that replicates the movement of the lower leg. And we test on actual riders to verify the results. This sock can save 2 watts at 50 km/h.

    Product features

    • Castelli's Fast Feet project — for riding in warm conditions
    • The foot portion is based on the 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
    • Weight: 49gm
    • Temperature: 10°C - 30°C
    • Fit: Aero
    *Please note that our specifications may be impacted by running substitution changes, we highly recommend confirming the specifications of our products at the time of sale. *Recommended Retail Prices are subject to change without notice and may vary from store to store depending on freighting and assembly costs. Please read our Terms & Conditions

    *Giant & Liv Bicycles are available for purchase online, but due to warranty regulations, must be shipped to qualified Giant dealers, as bicycles must be assembled by a qualified bike mechanic in an approved store - This is an international policy and usually will require an additional fee to build the bike. This will be confirmed by one of our online staff after purchase of the bike.

    *Specialized Bicycles are available for home delivery nation wide.

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