Daniel--
I really liked your link to the Aegismax Ultralite 800 down bag. It looks like a super bag at a good weight and price if it happens to fit your personal EN temp rating criteria. Here is one thing that mystifies me. That link lead me to another down bag at similar price but with different temp ratings. The lower limit (called "men" in some cases) was identical. However both the comfort ("Women") were higher (not as good). Is it possible somehow that the insulation value can be different at the extremes and the same in the center?
Shouldn't it be a linear function? Can one bag be warmer at the high and low but the same for the middle (men) rating????