Based on the last few weeks, it would have to be both warm AND waterproof!! Fortunately the Cascade Mtns on your side of the basin soak up the majority of wet and we only get the "leftovers. Thanks

I was looking at the Cabela's site a couple days ago, they have both UnderArmour and heavy silk tops and bottoms. I have heard good things about Underarmour, probably a step below being plugged in, but a step above dressing like the Michilin man.