I think I have the 'thin base layer - active insulation' thing covered with the Kuiu Kenai and various next-to-skin base layers. I'm not sold on the concept yet mainly because I tried this earlier in the year and didn't have enough 'warmth' with just the Kenai, base layer, and Kuiu Guide jacket at 35 degrees. I'm waffling between a thin base layer - thinish second layer with an insulating puffy in my pack and a thin base layer with a more substantial second layer and puffy in the pack. I'm leaning toward the latter. I seem to do alot of 2-3 mile hike ins, then stand around for 2-3 hours with temps in the teens to 20's. I also do alot of still hunting in those same temps. They seem to require slightly different setups to be comfortable for the day - I very seldom go back to camp during mid-day. What I take in is what I have for the day.
