As the sixth model of the original aero jersey, the Castelli incorporates years of improvements in aerodynamics and fit into the new Aero Pro Full-Zip Jersey. The front and sleeves of the jersey feature the stretchy, moisture-wicking Velocity Rev2 Fabric with 3D mesh on the back for extra breathability. The shoulders are constructed for optimal airflow, and the elbow-length sleeves with a raw-cut edge stay in place as we train to maximize our watts.