Space blanket is useful
Few times in Patagonia and in Bolivia we were camping and I was bitterly cold, despite down winter sleeping bag, silk liner, thermarest and thermal underwear! On these occasions, I got my space blanket under the thermarest then wrapped myself with it over the sleeping bag. I looked a bit like a giant Xmas cracker but hey!
It does not create heat as such, but keeps the warm air inside and it helped a lot for me, as I felt warm quite quickly and I was able to sleep!
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