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Castelli Soudal Quick-Step 2025 Aero Race 8S Jersey: over a decade of innovation and knowledge of speed. The fastest jersey is now faster. In the world of high-performance cycling, we seek more watts and more speed from our gear. Dressing for speed is one of the best ways to become faster, as 80% of a cyclist’s drag comes from the body. Based on over a decade of innovation and knowledge in making professional cyclists faster, the Aero Race 8S jersey is the result of using the most modern methods and fabrics to create the fastest jersey ever made by Castelli. The S stands for “speed.” The sleeve construction uses CFD engineering for optimal seam placement. The ribbed fabric designed for the shoulders has been specifically developed for maximum aerodynamic advantage at racing speeds, with a CdA savings of up to 6% compared to previous aerodynamic jerseys. The rest of the jersey is designed for maximum comfort. The body fabric is smooth and elastic, allowing for a perfect fit and a pleasant feel on the skin. The elastic waistband keeps the jersey in place, supporting the three rear pockets when they are full. The Aero Race 8S jersey is the perfect gear to help you turn your watts into speed.