Castelli Fast Feet 2 TT Shoe CoversThe Castelli Fast Feet 2 TT Shoe Covers have been created with a focus on optimising your performance during the high-speed efforts of time trials. Offering a snug and streamlined fit, achieved via CFD analysis and wind tunnel testing, the Fast Feet 2 TT Shoe Covers are designed to improve aerodynamic efficiency, reducing drag and boosting speed for no increase in power output. A marginal gain for high-speed efforts. The covers utilise a two-part design. The lower section is a smooth silicone to produce a streamlined profile across the foot.  The tall upper portion uses slim grooves to help detach airflow over the leg to decrease drag. The two surfaces work together to make these the ultimate choice when you want to gain vital time on rivals, particularly in time trials but they're also great in road races too.Features:Materials: 83% Polyamide, 17% ElastaneCastelli's Fast Feet project — for time trialsExtensively tested to be the fastest foot covering for time triallingSilicone-coated fabric over the shoe smooths out airflowEngineered grooved Lycra® on the ankle portion helps detach airflowFlat polyurethane tape at the top to keep shoe covers in placeBuy Castelli Clothing from Chain Reaction Cycles, the World's Largest Online Bike Store.