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When weekend racing, high-speed training, or chasing KOMs is our riding style, we head out in the Castelli Aero Race 7. 0 Jersey for all-day riding comfort and efficient aerodynamics. The CFD-based fabric placement and seam construction, along with an Airflow shoulder construction and elbow-length stretch sleeves, are why this jersey is engineered for aerodynamic efficiency from 18. 5 to 34mph.