Castelli thought of everything creating the Quick-Step Aero Race 6 Men's Road Cycling Jersey. 1 providing aerodynamics worthy of racing. Velocy Rev2 front end and Airflow shoulders cut through the air so sharply that nothing is holding him back. There is a pocket on the back for numbers that's why even badges don't hold us back and the 3D mesh provides ample ventilation and breathability helping you keep your cool during a hot race.