We're always looking for that perfect layer that can keep up with our pace, and the Do. Di. Ci. Jacket from Castelli is the answer. With next-level breathability and a race-fit cut, this jacket disappears into the ride while keeping us protected from cool, wet conditions. Thanks to Castelli's exclusive Ristretto stretch fabric, we get 12 times the breathability of their previous jackets—no more clamminess or wind-chilled sweat. The close-to-body fit is aerodynamic without feeling restrictive, and minimal seams reduce water ingress for comfort on drizzly rides. When it's time to push the tempo, this jacket is ready to go.