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I think it was a few degrees warmer, between -15 and -20*F

the dry pine needles was the key. The first night I felt a bit chilled on the backside, not too badd, but enough to do something. There wasn't much snow on the ground, and there were some thick spots...

I've pushed a 20* full length uq with a 0* tq down to -25* and was comfortable. Besides being dressed right and preheating my quilts, I used a vapor barrier bag liner, and beneath the hammock I piled...