I have a North Face Snowshoe with the Polarguard 3D, rated around zero. When it was new, it was good to around +20. In the last 6 years or so, the insulation has deteriorated to the point that it's now around a 40-45 degree summer bag. However, I just used it last weekend in such conditions and it worked fine.
DancesWithKnives
DancesWithKnives