Castelli Fast Feet 4 Socks 2026

Description

Castelli Fast Feet socks have been developed and tested to earn the name “aerodynamic”.

There are many so-called “aero socks” on the market. But only Castelli Fast Feet 4 socks have been developed and tested to truly earn this name. The few socks that have been tested were probably assessed in static conditions, without movement, because it is simpler. But the foot is always moving, so a model was created to replicate the movement of the lower leg. And we tested it on cyclists to verify the results. These socks can save 2 watts at 50 km/h. The new version features an updated cuff fit for greater comfort and aerodynamic benefits.

Technical Specifications:

• Weight: 48 g
• Temperature: 10°C - 38°C / 50°F - 100°F
• Fit: Race

Product Features:

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 grip strip at the top to keep the sock in place

The leg section is made from Lycra® with engineered grooves to improve airflow

Technical Details

Manufacturer Information

Castelli’s roots lie in Vittore Gianni’s tailoring shop, founded in Milan in 1876; Maurizio Castelli created the scorpion brand in 1974. Today it is based in Fonzaso and makes clothing for your rides, from jerseys to shorts. In 1977 it introduced aerodynamic Lycra shorts, used in racing and sold to the public.

Manufacturer

Manifattura Valcismon S.p.A.
Via Guglielmo Marconi 81/83, 32030 Fonzaso, Italia
www.castelli-cycling.com/it-it/pagesservizio-clienti-centro-assistenza

Product identifier

EAN 8056006588303 · SKU 4526030-001-L/XL

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