The socks Castelli Fast Feet 3 are designed for road running or when you can't wear a Fast Feet TT shoe cover, this sock will save you watts.

• The Fast Feet design by Castelli for riding in hot conditions.
• The foot part is based on the Castelli Red Race Sock for comfort in the shoe.
• Polyurethane grip strip at the top to keep the sock in place.
• Leg part made with ribbed Lycra designed to help detach airflow.
• Color: Blue (BELGIAN BLUE).