When riding in mild temperatures, we like a breathable and protective outer layer that we can trust, and that is why we like the Castelli Perfetto RoS 2 Jacket. This jacket provides superior wind and water protection with the Castelli-exclusive GORE-TEX INFINIUM WINDSTOPPER fabric and taped shoulder seams. Its full-length YKK Vislon zipper opens at both the top and bottom for an easy on and off, while a zippered side opening provides ventilation when things start to heat up.