As seasons switch, the Castelli Transition 2 Jacket becomes a staple in our cycling wardrobe. This midweight jersey-fit jacket provides wind-blocking coverage and just enough insulation for mild fall and winter rides. GORE-TEX INFINIUM WINDSTOPPER on the front and sleeves is the star of this layering piece, keeping brisk air at bay while we cycle by yellowing leaves and bundled-up commuters.