When you live in the south and can layer, the cheaper ones should be just fine indoors. We have heater buddies, and while propane lasts, a fireplace to curl up near. Most of our heat escapes through our heads and I have knitted many soft, but tightly knit hats and scarves. We can also through warm quilts over the whole mess! Since we are not bugging out, but will stand our ground, these should work fine. They came yesterday, but we took our two day vacation, soo have not checked them out yet. I think that anything we have that helps, could be the difference of life and death. Ga. winters are not that long and harsh.....no watch,,,this winter....twenty below!