well it didnt get down to minus 10...possibly minus 5???? and I was warm as toast snuggled up in beech saplings in deep leaf litter.slept like a log. actually didnt shut bivy bag completely ,had in nearly shut when sleeping on my right shoulder and flipped lid back when on my back of left shoulder.didnt have sleeping bag done right up either...neat being able to tuck pillow of cloths into the top of bivy bag it kept bottom half nicely propped up as well as a head rest. am confident could do same again in much colder and be ok..trick being I was out of breaze.
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