Castelli Fast Feet 4 Socks
There are lots of so-called aero socks out there. But the Castelli Fast Feet 4 Sock has the development and testing to back up the claim. The few socks that have been tested have probably been tested with a static, nonmoving test because it's easier. But a foot is always in motion, so they created a jig that replicates the movement of the lower leg. And they tested it on actual riders to verify the results. This sock can save 2 watts at 50 km/h. The newest version has an updated cuff fit for more comfort and aerodynamic gains.
- Castelli's Fast Feet project — for maximum aerodynamics
- Foot portion based on 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
Original: $54.36
-65%$54.36
$19.03Product Information
Product Information
Shipping & Returns
Shipping & Returns
Description
There are lots of so-called aero socks out there. But the Castelli Fast Feet 4 Sock has the development and testing to back up the claim. The few socks that have been tested have probably been tested with a static, nonmoving test because it's easier. But a foot is always in motion, so they created a jig that replicates the movement of the lower leg. And they tested it on actual riders to verify the results. This sock can save 2 watts at 50 km/h. The newest version has an updated cuff fit for more comfort and aerodynamic gains.
- Castelli's Fast Feet project — for maximum aerodynamics
- Foot portion based on 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
