Castelli Fast Feet 4 Soudal Quick-step 2026 Socks White EU 40-43

The Soudal Quick-Step 2025 Fast Feet 4 Socks are designed for cyclists seeking aerodynamic performance and comfort on their rides. They combine advanced technology and a specific fit to optimise every pedal stroke.This model, developed by Castelli, is part of the Fast Feet project, focused on aerodynamics. Its design has been tested with special equipment that simulates the real movement of the foot, achieving a reduction in wind resistance that saves up to 2 watts at 50 km/h. Made from Lycra with grooves that separate the airflow, it improves aerodynamic efficiency. In addition, it features a lower section inspired by Rosso Corsa socks to ensure comfort inside the shoe. The race fit ensures a perfect hold, while the polyurethane grip at the top prevents the sock from slipping during pedalling. With a light weight of 53 grams, it is ideal for those seeking a balance between performance and comfort.