I already have a Castelli Perfetto jacket that's very versatile through a wide temperature range with different base layers, but I wanted something more specific for colder temperatures that was comfortable without the bulk of a thicker base layer. This is that jacket. Very comfortable. Not even a chill in the low 30's with only a short-sleeve base layer. The double layer cuffs absolutely keep the cold from going up the sleeves. The wind blocking is excellent. The insulating front inner layer extends into the sleeves and makes it cozy and yet it's still quite breathable. I wasn't sure I needed another jacket, but now I know I did.
This is an expensive jacket, no doubt.But if you don't feel like freezing on the bike is what makes you strong, then consider this as the one jacket that will keep you riding. I have ridden in freezing fog, cold windy days, and something less than a downpour and this jacket did the trick. I like that there are two layers with zippers you can use to regulate warmth. I like that it is not bulky and maintains aerodynamics for the downhills. I like that the zipper is easy to find with gloves on and vent as needed for the uphills. I especially like that I don't finish a ride feeling like I need to squeegee the sweat off me before a post ride coffee. It was the jacket I asked for when we moved from the desert to the mountains, and I am glad I did.