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  • Regular price $65.00

We aim to ship items in stock next day, and place the other items on back order, to be delivered when they are in stock. Bicycle Express strive to keep this website up to date with correct QTY, Price and Description however there may be errors. In the unfortunate event that an error is encountered, Bicycle Express reserve the right to refuse to sell the products, and to correct the error. If Bicycle Express decline your order, we will contact you and either fully refund you, or offer you another option.

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Shipping Information


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

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

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.