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I used to sleep in my lane cruiser on a futon mattress with sheets and a down comforter that's it in weather down to -20F
I had a dog with me too tho
Maybe that helped
Before I got the feather comforter I used about 6 wool blankets
In both cases I was toasty as duck
My breath would frost the inside of the truck tho
Was awesome actually
>pic related
This was in spring