Castelli continues their pursuit of the best options for performance long sleeve jerseys with protection features that in many cases will allow you to leave the jacket behind, or at least only for a major conditions change. The Nelmezzo RoS Jersey is a perfect option for cooler days (50 - 64°F) when there is a chance of precipitation. Featuring an evolved version of Nano Flex called Nano Flex Xtra Dry, the Nelmezzo RoS is truly a great choice for Rain or Shine cycling because it is warmer than a normal thermal jersey but more breathable than a windproof jacket.

The key to making such a piece work always comes down to the fabric technology, and Nano Flex Xtra Dry is a double-layer fabric with a polyester inner layer covered by a nylon outer face that keeps more wind out than your traditional jersey. The unified fabric has a soft inner surface, and no membrane, a combination allows some airflow to maximize breathability and maintain temperature and moisture balance. The Nano Flex aspect brings the water repellency you need for a light rain, road spray, or a quick shower. You will prefer a shell for steady rain, but the Nelmezzo hits covers the in-between scenario, which if you are wondering, makes sense as Nelmezzo is the Italian word for middle.

This clean, typically Castelli design features an anatomic form fit, with vertical panels for coverage and appropriate stretch, good neck coverage, short front, long back with hem gripper, reflective bands on the arms and at the base of the pro-style 3-section rear pocket. As always, a smooth functioning, full length YKK Vislon zipper graces the front of the Nelmezzo. To the right of the rear pocket, a covered key pocket sits along your side. With good overall stretch and feel, the Nelmezzo RoS Jersey is a comfortable piece that can be work on the skin or with a baselayer. We can see this becoming a Colorado favorite for 2-3 season use, and a great Fall/Spring option for many parts of North America.