Looks like I'll probably buy that book Bill cited. In the iterim, I do and have understood the bit about 8mm weighing about an ounce per yard. What I don't know is if that in any way translates to the actual density of the weave, or "thread count," if there's a way to correlate... Understanding that much synthetic fabric used now, such as the Momentum, weighs about an ounce per yard and is downproof, that synthetic fabric is also callenderized, no? I've said it before, and I'll say it again (please pardon the cliche)-- the BPL community is truly awesome. The vast amounts of knowledge pooled here... wow.
Regarding the DAM--Bill, thanks for the pics, my computer seems to be taking all day to download right now?-- I'm slightly confused about the poly tubes. I mean, they're cylindrical tubes, right? So when combined/added to their baffled "containment device," is there not still a sewn-thru jacket reduction in insulation between tubes? If so, is that a practical concern? And if it is, is there a way around it? Has anyone looked at playing with a laminating machine and just some single-layer poly? (I ask having read all the preceding, including Hufeza's experimentation...)
-Photos finally came up, computer was just acting up. That looks great! (And partially answered my above questions.)