Castelli thought of everything when they designed the Men's Quick-Step Aero Race 6. 1 Road Cycling Jersey for race-worthy aerodynamism. The Velociy Rev2 front and airflow shoulders slice through the air so sharply that nothing holds him back. The back boasts a pocket for numbers so even pins don't hold us back, and 3D mesh maintains plenty of ventilated breathability to help us keep our cool when the race gets heated.