Built for excellent weather protection during spring and fall rides, the Castelli Perfetto RoS 2 Wind Short-Sleeve Jersey offers the perfect amount of warmth without sacrificing breathability. Its lightweight GORE-TEX INFINIUM WINDSTOPPER 203 Stretch fabric on the jersey front and sleeves blocks the wind, while its back Nano Flex Light Woven fabric keeps out water for a comfortable, dry ride. The Perfetto RoS 2 Wind can be worn as a stand-alone jersey with a base layer for mild days, or as a vest-like layer over a jersey on colder days for an extra layer of warmth.