Castelli Fast Feet 3 Aero Socks The Castelli Fast Feet 3 Socks are designed for riders chasing every aerodynamic advantage. Developed as part of Castelli’s Fast Feet project, these socks are engineered to reduce drag when racing or riding fast in warm conditions. When time trial shoe covers aren’t practical, the Fast Feet 3 Socks deliver measurable aerodynamic gains while maintaining the comfort needed for long rides. Original retail value: $70 AUD Key Features Aerodynamic performance socks designed for racing and fast riding Part of Castelli’s Fast Feet aerodynamic development project Engineered grooved Lycra® leg construction helping manage airflow and reduce drag Polyurethane grip strip at the top keeping the sock securely in place Foot section based on Castelli’s Rosso Corsa Sock for comfort inside the shoe Designed specifically for warm riding conditions Lightweight and breathable construction The Fast Feet 3 Socks help turn your watts into speed, making them an ideal choice for racing, fast training rides and riders who care about every aerodynamic detail. From the World Tour to your door.