I have a 20* Incubator and Phoenix with Dutch's summer sock and I was literally sweating in 26* weather with wind. I'm sure the winter will get you down another 15-20 degrees. Just have to watch out for that condensation.
I also took my sock to the tailor and got a six foot long #3 zipper from Zpacks sewed along the seam. Much much much easier to get in and out without having to reach over your head to cinch and open the sock. I put two zipper pulls on for accessibility. Only added 0.8 ounces to the total weight.
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