Castelli Fast Feet 4 Socks - Black

Castelli Fast Feet 4 Socks – Maximum Aerodynamics and Comfort in the Saddle

The Castelli Fast Feet 4 Socks are designed and tested to offer real aerodynamic performance, distinguishing them from common "aerodynamic" socks available on the market. Engineered for the actual foot movement during pedaling, these socks can save up to 2 watts at 50 km/h, combining aerodynamic efficiency and total comfort.

Ideal for temperatures between 10°C and 38°C (50°F - 100°F), they are perfect for road cycling, races, and high-speed training.

Main Features

• Lightweight: 48 g, for a high-performance sock without bulk
• Castelli Fast Feet Project: developed and tested for real aerodynamics
• Foot zone inspired by the Castelli Rosso Corsa Sock: maximum comfort inside the shoe
• Polyurethane anti-slip strip: keeps the sock perfectly in place
• Lycra® leg with engineered grooves: promotes air circulation and cooling
• Updated cuff: greater comfort and aerodynamic advantage

Why choose Fast Feet 4

Unlike other models tested only in static conditions, the Castelli Fast Feet 4 replicate the actual leg movement during pedaling, combining aerodynamics, lightness, and stability. They are the ideal choice for those who want to maximize road performance without compromising on comfort.

Perfect for ambitious cyclists, these socks bring Castelli's efficiency and technology to your feet, turning every pedal stroke into a concrete advantage.