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castelli fast feet 3 sock black
Castelli Fast Feet 3 Sock White

CASTELLI Fast Feet 3 Sock

Original price was: $79.99.Current price is: $59.99.

CASTELLI Fast Feet 3 Sock offers aerodynamic comfort for warm weather cycling with grooved Lycra® and grip strip.
Free standard shipping Canada-wide over $100
30-day returns on eligible unused items
Ships from Guelph, Ontario

Decision guidance

Is this right for you?

Best For

Warm weather cycling where aerodynamic efficiency and in-shoe comfort are priorities.

What to Know

Race fit designed to stay securely in place with a comfortable foot portion based on the Rosso Corsa Sock.

Why We'd Choose It

Choose the Fast Feet 3 Sock for its proven aerodynamic benefits, comfort, and secure fit that supports high-speed cycling performance.

At a glance

Product facts

Fit
Race fit
Use
Road cycling in warm conditions
Key feature
Grooved Lycra® leg with polyurethane grip strip for secure fit
Product Story

Product details

Engineered for Aerodynamics and Comfort

The CASTELLI Fast Feet 3 Sock is part of Castelli's Fast Feet project, developed for optimal performance in warm conditions. The leg portion features engineered grooved Lycra® designed to help detach airflow and improve aerodynamic efficiency during rides.

Comfort and Secure Fit

The foot portion is based on the Castelli Rosso Corsa Sock, providing excellent in-shoe comfort. A polyurethane grip strip at the top of the sock ensures it stays securely in place, preventing slippage.

Performance Tested

Unlike many aero socks tested statically, the Fast Feet 3 Sock has been tested with a jig replicating lower leg movement and on actual riders, demonstrating a potential saving of 2 watts at 50 km/h.

Key Specs

Specs

Weight 52 g Lightweight design for performance
Fit Race fit Designed for aerodynamic performance and comfort
Questions & answers

Common questions

What makes the Fast Feet 3 Sock aerodynamic?

The leg portion is constructed with engineered grooved Lycra® that helps detach airflow, reducing drag and improving aerodynamic efficiency.

How does the sock stay in place during rides?

A polyurethane grip strip at the top of the sock keeps it securely in place, preventing slippage.

Is the sock comfortable for long rides?

Yes, the foot portion is based on the Castelli Rosso Corsa Sock, which is designed for in-shoe comfort.

Has the sock been tested for aerodynamic benefits?

Yes, it has been tested using a jig replicating lower leg movement and on actual riders, showing a potential saving of 2 watts at 50 km/h.

Delivery & Returns

What to expect

Shipping

Free standard Canada-wide shipping over $100 before tax.

Returns

45-day returns for eligible unused items.

Ships from

Ships from Guelph, Ontario
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