Thanks Ryan for this episode.
I have a very similar winter layering system for my legs I use primarily for ice climbing but also hiking and backpacking, which others here can visualize in this winter layering guide.
Winter Layering Guide – Pants (Activity vs Temperature)
Winter Layering Guide – Pants (Fit, Features, Function)
Although I’m using Arc’teryx in my layering system since their clothing fit my upper/lower body type the best (YMMV), plus some good Black Friday sales, for my sleep system in -20F and lower, I do use a Rab Argon Down pant to help fill the extra side sleeping space in my Nemo Sonic sleeping bag with this lofty down pant, in combination my Rab down jacket and use a lightweight Therm-a-Rest synthetic blanket in a quilt configuration overtop of my sleeping bag to help absorb moisture vapor/condensation away from my down bag.
Another difference from Ryan’s system is I will use an integrated base + windshell pant, like the Arc’teryx Proton Pant or Rab Incline Vapour-Rise Pant, which both utilize lightly insulated, highly breathable Teijin Octa insulation which feels comfortable next to skin and provides good thermal management across wide temperature range and activity levels, in combination with their respective integrated shell fabric which is abrasion and weather resistant but with good CFM.
Then, similar to Ryan’s system, and as shown in the links above, full side zip shell and/or full side zip lightweight insulated synthetic pants used on top, based on temp/wind/precip/activity.
Cheers!