north face cat's meow. the best sythetic out there. I tried all the brands, and none of them had a better feel then the NF, and the cats meow is slightly baggy in the shoulders, so you can change clothes in it on a cold morning. snythetic so its still warm when wet. temp reading is right on. below 20 degrees F, its a tad chilly. did I mention its less then 3lbs?

I'd go synthetic if there is any chance of rain on your trip. I went backpacking and we got caught ontop of a mountain in a crazy storm, and a friend was soaking and hypothermic and he was able to get into his bag (a sythentic) and not worry about getting it wet and having it be useless.