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Fast Feet 4 Sock reduces drag with aero-engineered Lycra and race-proven fit
What Our Gearhead Experts Are Saying:''I wear the Fast Feet 4 Sock on race day or whenever I’m chasing every second. The aero fabric feels fast, and the footbed fits like a Rosso Corsa?tight, supportive, and super breathable. They stay in place all ride thanks to the grippy cuff.''
When every second counts, we slip into the Fast Feet 4 Sock. Part of Castelli’s Fast Feet project, this sock is built to reduce drag where it matters most?on the leading edge of every pedal stroke. Engineered Lycra up top features vertical grooves that help detach airflow, while the polyurethane grip at the cuff keeps the sock locked in place at high speed.
Underfoot, the sock is built on the proven Rosso Corsa platform for in-shoe comfort and moisture control. It hugs the foot, supports the arch, and stays cool under pressure. Whether we’re hunting PRs or racing full tilt, this is the aero advantage we reach for when marginal gains matter.
Details
- Aero cycling sock designed for time trials and racing
- Upper cuff built from grooved Lycra to reduce aerodynamic drag
- Polyurethane grip band prevents sock slippage mid-ride
- Footbed design mirrors Rosso Corsa for breathability and support
- Built for in-shoe comfort during high-output efforts
- Ideal for road racing, TTs, and fast-paced group rides
- Item #CSTZ82L
Tech Specs
MaterialLycra, polyurethane grip sock
Heightcrew
Weightlightweight
Cushionnone
Activityroad cycling
Manufacturer Warrantylimited 2 years
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