Originally Posted by
Peter2
I've been very happy with this so far.
Gore Tool SO Neon Jacket
It blocks the wind in the front, and allows you to vent in the back.
The armpits have zippers to vent.
I've ridden with that and a Craft baselayer at ~35* and been comfortable.
It's ~20* today, and I'm going to really put it to the test.

I just got back from a ~25 Mile ride in 21 degree temps, at times with a headwind.
I was comfortable the entire time. I even unzipped the armpit vents.
I wore the jacket, a Craft baselayer & a Pearl Izumi long-sleeve jersey.
The baselayer & jacket would have been enough.
This may be the best cycling apparel purchase that I have made.
This is a very comfortable, incredibly warm jacket.