As the most aerodynamic jersey to ever sport the iconic red scorpion, the Castelli Men's Aero Race 5. 0 Full Zip Jersey saves a whopping 12 watts over the previous year's jersey. Its Velocity Dry fabric along the frontside is made of a tightly knit weave that's highly aerodynamic, quick drying, and extremely low in weight. The back and shoulders make use of dimpled 3D fabric for enhanced moisture management and wicking properties. This quick drying material allows you to wear this jersey in cool, in between conditions, as moisture build up is one of the key elements in robbing heat from your upper body. A compression band bolsters three rear pockets, preventing bulging pockets and ride supplies from jostling around on rough roads. Other key features include a silicone gripper waist for a secure, stay put fit, as well as a full length zipper for extra ventilation on scorching hot rides.