Jonathanwrote a review of Castelli Flanders Base Layer on December 26, 2014
Familiarity: I've used it several times
I ride in Southern California where it never gets too cold for serious jackets. This is great for cooler days or cold mornings where the high for the day is only 70. It is good enough to give you than morning chill protection with a vest on the way to the group ride. At the same time, I don't have to remove it later in the ride because of heat issues. I simply take my vest off and I'm good to go.
Been getting a ton of use lately.