Castelli Fast Feet 4 Sock

Castelli Cycling Socks Fast Feet 4 Sock Black

Developed as part of Castelli's Fast Feet project, Castelli Fast Feet 4 Sock Black are cycling socks designed to maximize aerodynamics. Their leg of the grooved Lycra® leg is aimed at reducing the resistance to the air, while the foot portion resumes the design of the Castelli Rosso Corsa Sock to preserve the comfort in the shoe.

Product Features

• Developed as part of the Fast Feet of Castelli project to maximize aerodynamics
• Footer based on the Castelli Rosso Corsa Sock to guarantee the comfort in the shoe
• Polyurethane holder in the top to keep the sock in place
• Party part of Lycra® grooved specially designed to reduce air resistance
• Graduate band improved for more comfort and aerodynamic gain

Technical characteristics

• Weight: 50 g
• Temperature range: 10 ° C to 38 ° C
• Cut: race
• Advertised gain: up to 2 watts at 50 km / h

Aerodynamics even in socks

To develop the Fast Feet 4 Sock, Castelli did not just have static aerodynamic tests. The mark has created a device reproducing the movement of the lower part of the leg, considering that the foot is constantly moving when the cyclist pedal. The model has also been tested on cyclists to verify the results obtained.

This approach leads to a specifically developed Lycra® leg portion to reduce air resistance. Castelli thus announces a gain up to 2 Watts at 50 km / h. The foot portion, based on the Rosso Corsa Sock, privileges the comfort inside the shoe. This fourth generation also benefits from a new cut at the top band to improve both comfort and aerodynamic performance.