by dskoon » Thu May 05, 2011 8:53 pm
[quote="fluxlib"]
My experience with the Marmot Helium (15F) is that you were toasty without additional layers down to about 30 and then needed some layers to take you down comfortably to 15 or so. Beyond that you are in for a cold, wrestless night but won't be hypothermic.
Yeah, temps really seem to vary bag to bag, even from the same manufacturer, etc.
Ex. the bag you speak of, my friend also has, Marmot Helium. However, he's complained about it not being quite as warm as the bag he was intending to replace(due to a little less weight), which was/is the Marmot Pinnacle. He claims the Pinnacle, also rated to 15f, is warmer than the Helium. I also have the Pinnacle, and though I haven't quite got it down to 15, I've been warm in it in low 20 temps on an icy night up in Yellowstone.