I am taking a winter mountaineering class in a few weeks in the Adirondack. The culmination is a 4 day 3 night trip to bag a few peaks and gain winter camping confidence. Expected temps are 20-40F during the day and 0-20F at night. The VERY extreme could be apx. -20F. I am confident in my upper body layering but I am concerned about my lower body.
Right now I have:
skin tight light weight thermals- worn always
Wicker's Mid-weight thermals- worn always
Wicker's Expedition weight thermals (similar to fleece pants)- worn at rest
REI eVent shell pants- worn always on top
I am confident in the mid-weight thermals and eVent shell while moving. I tested that all last season in everything from rain, snow, down to mid 20's, high winds… It is good as long as I stay moving. My concern is at night should I have down pants to stay warm. Something along the lines of WM Flash or Flight pants.
My ideal layering would be:
1. skin-tight light weight thermals- worn always
2. Expedition weight thermals (I added side zips to regulate temperature)-worn always
3. down pants- worn at rest
4. eVent shell- worn always on top
This would save me weight (a few oz) and obviously make me more warm, BUT is it necessary. I have spent enough money in preparation for this trip and if I don't need to spend more I would be a happy camper.
Hoping for warm thoughts.
Thanks


