I've got a Marmot Windshirt that is microfleece lined and nylon shelled and weighs only 12oz. However, it doesn't do well with fires. It does have vents at the pits and will withstand some minor drizzle. Good to 30F if you're moving, nice as a tentwarmer once you make camp, then you can take it off and use it as a pillow. You could layer it underneath a down vest if it wasn't too puffy and get pretty toasty during high altitude camping.

Actually, it is us who are temperature scale challenged. We also still measure stuff in miles and pounds, unlike the rest of the civilized world.

I finally got around to sewing pit zips onto my Montbell Thermawrap. It was actually easy and only took about an hour start to finish. Without the zips - I had trouble regulating moisture with this jacket, but with the zips - I love the jacket - Thanks for the directions OM.