The ranger at Denali's sled dog kennel taught me how to layer for -40 and I've been doing winters wrong my whole life
I stopped by the sled dog demo at Denali back in February when it was -22 and I was wearing four cotton hoodies like an idiot. One of the rangers noticed me shivering and pulled me aside, said cotton kills up here because it soaks up sweat and then freezes against your skin. She had me peel off two layers and swap in a wool base plus a puffy, and I was warmer in 10 minutes than I'd been all morning. Now I keep a wool base layer in my truck all winter. Anyone else switch their whole cold weather setup after a random tip from a park worker?
The whole "cotton kills" thing gets passed around like gospel but its way overblown for most people doing normal stuff. Cotton only really bites you if you're sweating hard and then stop moving in serious cold, like sitting still on a summit or standing around camp. For a walk from the car to the sled dog demo, four cotton hoodies is dumb but its not gonna kill you, you were just wearing too much and trapping sweat. Wool is great but its heavy, itchy for some folks, and costs a fortune compared to a cheap fleece that does the same job. People act like one ranger dropped ancient wisdom on you when really you just finally wore the right amount of layers.