If you're camping in a vehicle and have a backup battery , there are 12 volt warmer blankets to add to the warmth.
And if you really have to going walking in those minus zero temps , freezer jackets and pants are rated to -20 and they REALLY do work in a nice warm toasty way.
I paid $65 for mine from fleabay
And if you really have to going walking in those minus zero temps , freezer jackets and pants are rated to -20 and they REALLY do work in a nice warm toasty way.
I paid $65 for mine from fleabay