Description

Bullet Points.
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.
Overview 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 we created a jig that replicates the movement of the lower leg.
And we 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.
Product Care.
Fast Feet 4 Sock
the Castelli Fast Feet sock has the development and testing to back up the aerodynamic claims.
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