FAST FEET 4 SOCK

Castelli Fast Feet socks have been developed and tested to truly earn the "aerodynamic" label.

• Weight:52 g
• Temperature:10°C - 38°C / 50°F - 100°F
• Fit:

Castelli Fast Feet project: for maximum aerodynamics

The foot section is inspired by the Castelli Rosso Corsa Sock for maximum comfort inside the shoe

Polyurethane silicone strip at the top to keep the sock in place

The leg section is made of Lycra® with engineered grooves to promote airflow.

Fast Feet 4 Socks
There are many so-called “aerodynamic socks” on the market. But only the Castelli Fast Feet 4 socks have been developed and tested to truly earn the name. The few socks that are tested have likely been evaluated in static, stationary conditions because it is easier. But the foot is always in motion, which is why we created a model capable of replicating the movement of the lower leg. And we tested them on cyclists to verify the results. These socks allow you to save 2 watts at 50 km/h. The new version features an updated cuff fit for greater comfort and aerodynamic advantage.