Packed with more convenience features than ever, the Castelli Free AR 4.1 FZ Jersey is the revamped version of Castelli's Free Aero Race 4.0, the original pro racing jersey from four years ago. Now with a zippered back pocket, a neck protective flap behind the front zip, Velocity dimpled fabric on the front, and an easy-access angled pocket, the 4.1 is built for all-around riding performance. Velocity dimpled fabric with Aero technology is highly breathable, quick-drying and gives a smooth, streamlined fit. Nervato underarm inserts improve aerodynamics, full YKK zipper allows easy on/off, and mesh raw-edge arm grippers provide gentle compression and a clean finish. Silicone gripper hem stays put when you're down in the drops and three back pockets, plus a zip pocket are perfect for stashing essentials.