The boreal forest (taiga) swings from -40°F winter lows to 80°F summer highs. Proper clothing is survival gear.
Merino wool or synthetic (polyester) – wicks sweat, stays warm when damp.
Fleece, down, or synthetic insulated jacket – traps heat. Down: lighter, compressible. Synthetic: cheaper, retains warmth when wet.
Waterproof/windproof breathable membrane (Gore-Tex, eVent) – hard shell for storms; soft shell for active use in dry cold.
Winter: Add expedition-weight parka, vapor-barrier liners, heavy mitts. Summer: Lighten mid-layer, prioritize bug protection, rain gear.