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The Castelli Tutto Nano RoS women’s long sleeve jersey features a large number of improvements over the ones you currently use. First, the stretch fit allows the jersey to move with you, made possible by the Nano Flex 3G fabric. This tight fit makes the shirt warmer, preventing the fabric from fluttering in the wind. Secondly, the denser weft of the fabric compared to that of the fabrics used for traditional thermal sweaters, allows less air to pass so you stay warmer. Then there are the finishes made with water-repellent nanotechnology, a peculiarity of Castelli. On dry days, you won’t even notice it exists, but when you encounter light rain or wet roads, you’ll be drier. Finally, the 360 reflectivity, thanks to the panels on the shoulders and lower back. And then, of course, there is Castelli’s attention to detail, from the YKK Vislon quick-slide zip with the rubberized puller to the non-slip elastic to prevent the jersey from climbing.