Castelli Fast Feet 2 Sock

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

- 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