Originally Posted by
BillyBob58
Assuming a well designed, draft free, dif cut UQ ( to allow a nice snug fit and help avoid compression of insulation):
2.5 = mid/high 40s to 50F(at least)
5= 20 to 30
7.5 mid teens
10= zero to 5F
This is based on my personal experience at the warmer temps and using no other layers except cotton t shirt and jeans, with a CS WB Yeti. The rest is based on extrapolations from the warmer temps, plus what I have heard from some other folks, but in all cases using CS XP. Some say CS Apex is warmer for the weight, but I don't really know yet. Plus of course, people vary greatly and the above is when I or others were dry and well fed, and wind absent or well blocked.
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