Castelli's Rain or Shine gear offers properties and capabilities that make an ideal mix for a spring and autumn jersey like the Womens Tutto Nano RoS. With great stretch and comfort from the brushed fleece inner surface of the Nano Flex 3G fabric, and the external protection it delivers, you get the base essentials of a light jacket built into a jersey. It is perfect for pairing with an RoS series vest for flexible use in a variety of shoulder season conditions.

Castelli has proven their ability to use Nano Flex 3G for a stretch, supportive fit that moves perfectly with you, as they have used it in arm and leg warmers as well as their Sorpasso tights. This close-to-body fit actually makes the jersey warmer by avoiding fabric flapping in the wind and also takes advantage of the tighter knit of the fabric compared to traditional thermal jersey fabrics. It lets less air through so you stay warmer. The fabric also carries Castelli's proprietary nanotechnology water-repellent finish. On dry days you won't even know it's there, but when you get some light rain or road spray you stay pretty dry, maintaining warmth.

The Castelli obsession to quality details is seen in the tall, soft collar and YKK® Vislon® zipper, which also has internal flap so you don't get cold from the zipper head or get it caught in your cool weather beard. Generous use of reflective inserts delivers 360° in low light conditions, offering better safety in the shorter days.