I'm debating on whether to get the Sitka Ascent or 90% Pants. They will be primarily used for hunting Moose and Caribou in Newfoundland and Moose/Grizzly/Elk in Western Canada. Are the Ascent Pants a lot lighter than the 90% pants? If I were to wear a heavy base layer under them, would that be warm enough for temperature around the 0 degree mark? I'm planning to use these pants for a lot of walking so I would rather wear layers than having pants that are too insulated. How warm would the 90% pants be vs. the Ascent pants?