Perfect for 55-65F
This is the most thoughtful long-sleeve jersey I own. It's more like a very lightweight jacket. It's like someone at Castelli read my mind. The windstopper fabric extends through the entire front of the jersey, including the sleeves, keeping my arms protected from icey cold descents and fast flats where a winstopper vest and long-sleeve fleecey jersey has failed, resulting in shivering icicle arms, yet it's strangely still too warm for a full windstopper jacket. The neck is very high in front and back for added cold and wind protection. And if you get too warm, just unzip it. Looking forward to many more rides in Texas "winter" weather.
Two days later: as a side note, the "rosso corso" label came off in the wash, no biggie, the jersey is unharmed. Wore it again today, still loving it!