Castelli 6 Fast Feet Booties

✔ Ultimate aero accessory to cover shoes and calves for reduced drag
✔ For athletes searching for that last bit of performance gain
✔ Wind tunnel tests showed up to a 6-watt savings at 45 km/h compared to a normal sock
✔ Silicone-coated stretch fabric over the shoe smooths out airflow
✔ Engineered grooved Lycra® on ankle portion helps detach airflow
✔ Flat polyurethane tape at top to keep shoecover in place
✔ YKK® zipper
✔ Weight 59 g (S)