I'm sure this concept has come up but I couldn't find anything on it so here goes. I was laying in bed when the thought suddenly hit me heat rises correct so why don't I build a quilt with a thicker insulation on the top and sides going down to the pad. But for what gets stuffed under or almost under me most of the night why don't I use a thinner insulation? Then I took it another step even when sleeping In a down sweater up top, and just thrermals for my legs my upper body feels cold much before my lower. So from say knee leval down I could use a lighter insulation as well. I'm not a expert so would this work as well as I think it will? I guess it's kind of the same concept as wearing a vest not a jacket since your core needs more warmth. This quilt will be used for a xul/sul so I was going to make it with a closable head slit to be worn as a shawl.Second matter of thought was I still have the idea of usig tyvec 1443 as the outter shell since it's a great barrier at passing moisture and resisting water then I was going to use a 4.5mm silk as the inner. The insulation would be a combo of climashield apex 2.5 and 5 or maybe 2.5 and down hmmm. That would mean only about half the baffling for down and i could use 1443 for the footbox where the climashield is and 7d for where the down is?Last question is I have heard you lose some warmth going from something like m90 as a liner to silk is this true ? If so how much? So if you could answer the poll of questions to help me decide how to build this thing I would appreciate it especially input from Tim marshal te-wa javen and all you top notch quilt makers.
Variable insulation. Yes ? No ?
If yes with 2.5 and 5 ounce climashield or 2.5 and down?
If down how much loft of 900fp to match warmth of 5 ounce climasheild
Tyvec outer ?
If yes just foot box or full quilt ?
If just foot box m90 or 7d over the down section or upper section?
Thanks for reading all my wierd ideas if you can offer advice id be glad to hear
Silk or m90 liner?
