Castelli Fast Feet 3 socks 2025

Numerous models of so-called ‘aerodynamic socks’ are available on the market. But only the Castelli Fast Feet have been developed and tested to really deserve this name. The few socks that have been tested have probably been evaluated in static conditions, without movement because it is easier. But the foot is always in motion, so Castelli recreates a model that replicates the movement of the lower leg. We also carry out tests on cyclists to verify the results. With these socks you can save 2 watts at 50 km/h. The new version features an updated cuff fit for greater comfort and aerodynamic advantage.

Features

Castelli Fast Feet design, for racing on hot days
The foot part is inspired by the Castelli Rosso Corsa Sock for maximum comfort inside the shoe
Non-slip polyurethane strip at the top to keep the sock in place
Leg part is made of Lycra® with engineered grooves to promote air circulation

Technical specifications

Thermal insulation: 1/5
Waterproofness: 1/5
Wind resistance: 1/5
Breathability: 4/5
Lightness:4/5
Temperature: 10°C - 38°C

Technologies

Rosso Corsa
The Rosso Corsa label is applied only to the most technologically advanced products. Rosso Corsa represents a major step forward in innovation and reflects the meticulous construction you have come to expect from Castelli to improve athletes' performance.