John Fwrote a review of Castelli Alpha Ros Jacket - Men's on December 1, 2019
It's magical how a jacket with so little bulk can keep me so warm! So far, I have worn it down to 35F (measured on the gauge built into the Garmin 1030) over just a turtleneck Flanders base layer, with zero indication that it was anywhere near its lower temperature limit. The two-zipper system works exactly as claimed: unzip the outer zipper approaching an uphill, zip it back up going down the other side, prevents overheating and sweating. The ends of the sleeves are very glove-friendly, a big plus.
The outer zipper was slightly balky when pulling it down from the top so I applied zipper lube to the top few inches.
A small improvement would be to make the inner thermal layer removable (zippers?) so one could clean it without having to wash the entire jacket.
I am XL in all Castelli tops and and XL in this fits me perfectly.
Its $350 list price seems steep until you have used it. Then it seems worth every penny. Still, I was pleased to get mine on sale!