When there is still a chill in the early morning air, you want a jersey that keeps you warm without letting you overheat as the sun rises. Castelli's Prologo 4 Men's Full Zip Long Sleeve Jersey has the ideal fit and fabric for riding comfort. The Prologo 4 is sewn from Castelli's Prosecco 3D fabric. This knit is designed to keep you warm by moving moisture away and keeping warm air trapped near the surface of your skin. To further assist in moisture transfer, the jersey features stretch mesh panels on the arms and a full length YKK zipper to adjust as you see fit. Three back pockets hold all of your riding goodies such as gels, ID, and a flat repair kit. To make you more visible, small reflective tabs have been added to the back.