We've used the Nano Flex Light stretch woven fabric on the back of Perfetto vests and Beta jackets for a few years now. A tightly woven fabric, it keeps a lot of the wind out while being relatively thin and compact. And the lack of a membrane means that much more moisture can escape. Now we bring this fabric into a jersey that is lightweight yet surprisingly warm thanks to the way it keeps more wind out than a traditional jersey. We line the front of the jersey with a fabric that comes straight from our technical base layers for a little added warmth and to help move moisture away from your body. This jersey actually covers a wider range of temperatures than our traditional knit jerseys. Use it with a light sleeveless base layer for mild days, with a light long-sleeve base layer for moderate days, or with a Flanders Warm or Miracolo base layer and vest to stay comfortable in surprisingly cool temperatures. The stretch woven fabric is aerodynamic, and we give this jersey a close-to-body fit. Think of it as your Aero Race Jersey for spring and fall days.