For highly active pursuits, you shouldn't need anything heavier that Cap-1. I snowshoe with Cap-1 underneath windproof pants and have never felt cold well down into the 20's(Farenheit, ~-5 Celsius). When you rest, be prepared to throw on an insulating layer(fleece, Polarguard, down, etc). I have also tried Cap-2 and found it to be overkill, i.e. I start getting moisture buildup in the Cap-2. I also used to run in Cap-2 with no outer layer and was never cold through ~ the same temperature range.