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The Castelli TEAM SKY Aero Race 5.1 Jersey FZ is the same cycling jersey worn by Team Sky when they won the Tour de France. The Aero Race 5.1 is the fastest jersey ever made by Castelli, a company that has been making race jerseys for nearly a century. Castelli has used top level equipment to find the perfect aerodynamic design along with fabrics that keeps a rider dry and cool. After constructing the 5.1 cycling jersey, the design was further perfected after pro cyclists raced in the jersey. Castelli engineers learned to minimalize Lycra® content and replace it with Velocity dimpled fabric on the front and 3D mesh on the back. These very porous yet close fitting fabrics were found to have the best results for rider satisfaction while they raced in their Castelli gear in the pro peloton. Through wind-tunnel testing these updated fabrics on the front and back showed a 2-watt gain. Small details have been added to increase how much time you save. The compression band around the pockets keeps them from moving or bouncing no matter how you load them up. Mesh arm bands are elastic so air flows over the part of the body that hits the wind before the rest of the body. Weighing in at just 103 grams the 5.1 is not just aero; it’s also extremely lightweight. The 5.1 Aero Race jersey is about 40 g lighter than a standard jersey and almost as light as Castelli’s Climber’s Jersey. The lightweight polyester fabrics in this jersey dries nearly instantly. In the 5.1 you stay comfortable when you sweat. A reflective heat-transfer viz strip deflects the sun’s heat making the outside heat less of a threat. When extra cooling air is needed, the full-length YKK® Camlock zipper is as easy to open as it is comfortable against the skin.

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