I use medium size on Pearl Izumi PRO and ELITE lines. This one fits me a little tight on XL size. Very slim line.
It is a realy good springfall jersey. Exelent finishing and technical clothes. I had ordered a second one.
Okay, I use to never ride in the rain or cold even semi cold but then I got a pair of Castelli NanoFlex tights and they worked so well I followed that purchase up with the NanoFlex arm warmer and now this Perfetto Light jersey. I should have purchased two of them becasue I use it just about everytime I ride. If it's colder out I use a merino base layer if it's warmer I use a light base layer or nothing at all. The fabric on this keeps the wind and rain off you yet breaths so well it feels like you are riding on a nice summer day with just a light jersey on even in the rain. Fanatic!!!!
I bought the red version and I am not disappointed. Fit is excellent, a point of concern with most people saying to buy a size up compared to other companies. It's tight but not in a bad way. Constructed very well and is really comfortable. It's very bright in color and should keep me visible. Since this is my first Castelli Jersey I am very pleased with it and hope it lasts a good long time. I really like the Corsa Rosso level, it just feels like quality gear and definitely looks good.