For roadbiking, I have an Assos sJ.13 luftSchutz shell, it’s unbelievably good. Ridiculously thin but surprisingly insulating when worn over a midlayer.
It’s breathability can best be compared to witchcraft. After a ride you can see little patches of salt on the outside where it’s wicked sweat through.
Wore it yesterday, 7°c, damp, showery and lots of roadspray on the chaingang. I had a Craft Windstopper-fronted l/s base layer, a long-sleeved jersey and the LuftSchutz on top. Perfect.
Not cheap, but the fit is excellent and the stretch panels do a brilliant job of keeping it snug but with lots of flexibility. And it packs smaller than a packet of Frazzles if you need to take it off.