Castelli's Fast Feet project: aerodynamic foot coverings for every condition. The road shoecover is made for racing and training in cool conditions and combines aerodynamics with full wind protection and good water protection.The silicone-coated stretch fabric smooths airflow over the feet while keeping out wind and rain. The ankle seam is taped to further enhance water protection, while the cuff has a silicone bead to prevent water from entering from the top. It's not insulated, so it's not made for cold conditions, but from 8°C/45°F and up it offers good protection while maximizing aerodynamics.