Aaron has used this bag on Denali and in Yellowstone in the winter. He hasn’t been cold in this bag yet. It’s rated to -25 deg F. This is a real expedition bag with all the extra features, baffles, and neck tubes you would expect in a serious expedition bag.
Get Antarctic Tears that talks about skiing Yellowstone in the winter: https://amzn.to/2Ef66rD Aaron has skied across and through Yellowstone in -45 degree temperatures for several years. He knows what it’s