Thanks for the replies. Last year I managed through a 4 day weekend training in the White Mountains with Patagonia long johns, sweat pants and ski pants, and was quite comfortable. I'm concerned about the (cotton) sweat pants getting wet, that's why I'm looking into the fleece pants. This year, we were also issued ECWCS pants to go with the parkas, but I'm thinking that the Gortex pants might be more than necessary. At least I'll have a few combination options.