I was just checkin out thru-hiker.com for the first time in a while, and they have 5oz/square yard climashield XP, with a clo/oz of .81.
The 180 quilt should have about the same weight in insulation (~5.15oz/yd if my calcs are correct).
Thru-hiker says that with .42Clos, that should be warm enough for a 20F quilt? I figure polarguard delta should be much the same in terms of warmth...so are thruhiker way out in their estimates, coz from what ive gathered so far in this thread, most ppl would struggle past 32F without added insulation in a UL180.
I just bought a UL180, and it seems great so far, I figure without added insulation except maybe socks and a possumdown beanie, I should be good for 32F, given that I am a cold sleeper, and comparing the thickness of the quilt to my old polarguard 3D s/bag. Itll be a couple more months before I can test that-it isnt cold enough yet here in South Aus.
Or should I have gone and bought some climashield and made my own quilt for a bit better performance?