Designed for road racing or as an alternative to the Fast Feet TT Shoecover, this sock reduces drag and saves watts. While many aero socks claim performance benefits, the Castelli Fast Feet stands out thanks to extensive development and thorough testing. Unlike others tested in static conditions, Castelli’s testing simulates realistic movement to ensure genuine aerodynamic gains.
Since the foot is constantly moving, we developed a device that mimics lower leg motion and conduct tests with real riders to confirm the data. This sock can reduce drag and save 2 watts at 50 km/h.
KEY 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: 53 g
Temperature: 10°C - 30°C
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