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Developed by Castelli for pro riders, the aerodynamic Castelli Free AR 4.1 Jersey FZ will cut valuable seconds off your ride. The Free AR 4.1 Jersey saves approximately 12 watts at 25 mph compared to a normal race-fit jersey. The dimpled Velocity fabric on the front and shoulder panels provides a smooth, clean fit to reduce boundary layer drag and delivers excellent wicking and faster drying. Wide raw-edge Nervato fabric sleeve cuffs maintain a flat, aero profile while the silicone waist gripper secures jersey placement. A full length front zipper puts custom venting at your fingertips and other details include two rear reflective tabs and three elasticized rear pockets with a fourth zippered pocket. This makes it the one ideal jersey for all your rides, whether you're sprinting for the win or trying to survive the Sunday group ride.