Hey guys, made my first poncho liner underquilt last night. Got to thinking about reflecting heat and used some radiant barrier that I had for my attic when I insulated last winter. I sewed that in between the poncho liner halfs and holy hell, I feel like there is a heater turned on with the barrier in there. Its amazing.... Now I just need to test it outside, as hanging from the wall doesnt have same effect as cold outside does.... next stop, the diy hennesy hammock!