Short Description
The Castelli Fast Feet 4 Socks are aerodynamic cycling socks engineered to reduce drag and improve performance on fast rides and race days. Featuring grooved Lycra® construction and a secure race fit, they combine comfort, breathability and proven aerodynamic efficiency for competitive road cycling.
Key Features
- Aerodynamics: Engineered grooved Lycra® leg section helps smooth airflow and reduce drag
- Performance: Designed as part of Castelli’s Fast Feet project for maximum speed and efficiency
- Comfort: Foot section based on the proven Rosso Corsa sock for in-shoe comfort
- Secure Fit: Polyurethane grip strip at the cuff keeps the sock firmly in place
- Race Ready: Lightweight construction ideal for racing and high-intensity riding
Product Overview
The Castelli Fast Feet 4 Socks are designed for riders looking to optimise performance through improved aerodynamics. Developed and tested under real riding conditions, the sock’s grooved Lycra® leg construction helps manage airflow around the lower leg, with testing showing potential savings of up to 2 watts at 50 km/h.
The foot section is based on Castelli’s trusted Rosso Corsa design, ensuring comfort inside the shoe, while the updated cuff fit improves both comfort and aerodynamic performance. These socks are ideal for racing, fast training rides and warm-weather road cycling where marginal gains matter.
Specifications
- Brand: Castelli
- Product Name: Fast Feet 4 Socks
- Product Type: Aero cycling socks
- Fit: Race fit
- Material (Main): 85% polyester, 15% elastane
- Material (Ankle): 82% polyester, 18% elastane
- Weight: Approx. 48–50 g
- Temperature Range: 10°C to 38°C
- Sock Height: Medium / aero cuff
- Gender: Unisex
- Use: Road cycling, racing
- Season: Spring / Summer
- Model Year: 2026
Ideal For
- Road racing and fast training rides
- Aerodynamic performance gains
- Warm weather cycling
- Riders seeking marginal speed improvements
What’s Included
- 1 × Pair of Castelli Fast Feet 4 Socks
Care & Notes
Machine wash at low temperature. Do not tumble dry. Air dry only to maintain elasticity and aerodynamic performance. Ensure correct sizing based on shoe size for optimal fit.
Why Buy From LK Bikes
LK Bikes offers premium cycling clothing and accessories from trusted brands, backed by expert advice, dependable service and strong aftersales support.
