Short days often call for long sleeves if you want to stay warm in the cooler days of fall and spring. Blending warmth, breathability, and a comfortable fit, the Sinergia Full-Zip Long-Sleeve Jersey extends your riding season with Classic Castelli style, whether it's worn as a standalone jersey or as a mid-layer under a heavy duty winter jacket. It's constructed from Castelli's Warmer fabric, which is soft and fleecy on the inside for next-to-skin comfort, while proving the technical properties you expect from a performance long-sleeve jersey. The thermal material is an effective insulator, but also actively moves moisture to the outside of the garment for quick evaporation during more intense efforts, avoiding clamminess when it's cold and preventing overheating should temps rise.The form-fitting Sinergia Jersey is anatomically cut for the cycling position, reducing drag while remaining stretchy to ensure mobility as you transition in and out of the saddle. Three rear pockets store the supplies you need for long and short rides alike, while reflective inserts help with low-light safety.