Warmth, style, and fit' Check, check, and check. The Cielo Full-Zip Long-Sleeve Jersey from Castelli uses its Warmer Plus fabric on the body and sleeves and features a slightly tighter knit to trap body heat while remaining lightweight and transporting moisture quite well. Castelli employs its Warmer X-Stretch material on the rear of its side panels helping improve the fit while in the saddle and increase breathability. On the back of the jersey, Castelli used some unique construction details including a drop design for the 3 rear pockets for a better fit at the waist. Those pockets also get reflective heat-transfer viz strips for better visibility in low light. The inclusion of an elastic gripper there also prevents the jersey from riding up during the duration of your ride. Up front, a full-length YKK Vislon zipper lets you control the amount of airflow while the Zen neck flap covers the zipper without the complications of a zipper garage.