Castelli Women's Perfetto RoS 3 Jacket A revolutionary cycling jacket that can do it all in all weathers. The Castelli Women's Perfetto RoS 3 Jacket is windproof and yet incredibly breathable. Essentially waterproof but free of harmful PFAS. It's the biggest leap forward in all-around cycling weather protection since the original Gabba. And it's made possible thanks to the development of an exclusive 150 g Polartec® AirCore™ electrospun air-permeable membrane.  Breathe easy with Polartec® AirCore™ With its Polartec® AirCore™ construction, the Perfetto RoS 3 is significantly more breathable than its predecessor, allowing you to increase ride intensity and speed without being drenched in sweat immediately. Its resistance to water ingress is improved too, keeping you drier for longer when storm clouds burst. Zippered chest vents allow control of airflow, and a two-way full-length front zipper means you can vent from the top and bottom too. This combination of outstanding breathability and reliable water-resistance will keep you drier and more comfortable, perfect as the weather changes and the intensity of your ride varies with the terrain. Versatile layering  Slightly thinner than the previous iteration, it can be worn alone on milder days, but adding insulating base layers can easily take it down to colder temperatures. An extra level of stretch allows a figure-hugging fit, saving you energy without sacrificing comfort or mobility. The Perfetto RoS 3 Jacket is the ideal choice for almost all your autumn, winter and spring riding.