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I take synthetic stuff and even a vest would help extend the reach of your underquilt. Speaking of pillows, my Cocoon UL pillow is like custom made for hammock use.
Getting back to bottom insulation, pads just suck in a hammock. I would love to see an asymmetrical design hammock with a big pocket in the bottom, say 4" deep, that you could slide insulation into. Think of a big square/diamond shaped quilt or separated pillows and add a little Velcro to keep them in place. Much like Clark's insulation system, except one big pocket covering the center 3/4 length of the hammock and close to the full width.
I think it would be interesting to try an insulated air mattress as a pocket insulator, or one built just for that purpose that could snap or Velcro to the bottom of the hammock. Since it would not need to hold any weight, it could be a differential cut for a good seal to the sleeper's backside and could be made of the lightest materials. The inflation would only be to provide loft and you wouldn't actually want it to be as firm as a ground mattress. Some reflective material could be used for the upper side. You could side a thin foam pad between the hammock and the mattress for a little more insulation. Some Reflectix type material might be interesting there too.
If you want a light, cheap insulation system, check out the Garlington Insulator concept. (see http://www.garlington.biz/Ray/HammockInsulator/Insulator.htm). Ted Garlington cooked up the idea of using an under cover with bags of material inside to provide insulation. I built one using a hoodless poncho as an under cover and then I use the open cell foam pad from the Hennessy SuperShelter system (you can buy them separately). That gives me back some weight for multiple use as rain gear and gives more wind and rain protection for the hammock. The poncho has 3/32" shock cord in channels on all four sides with toggles for adjustment and weighs about 10oz. A Cuben version would be great and needs little strength as it isn't stressed like a shelter skin.

I did some experimenting with bags made from space blankets and double-stick tape with crumpled/folded space blankets inside, which gave a couple inches of loft and they are quite light and cheap to make. Garlington used crumpled/folded space blankets inside a light garbage bag and you could use many type of material for loft--- even crumpled newspaper will create a dead air space. An under cover can be made from any rectangle of cloth with some shock cord drawstrings at least in the ends or all four sides. You could use a Grand Trunk Ultralight hammock with shock cord in the end channels and still swap out the suspension with whoopie slings later to use is as a day hammock.
If you just want to experiment with the concept, you can take a 108"x60" rectangle of just about any material and gather the ends with a sock cord lashing and tie them into your suspension. I was thinking about trying some polycryo window film. Add some Garlington Insulators and you have a full under cover with a couple inches of loft. Low density polyethylene trash can liners like they use for commercial/office garbage bags make the best off-the-shelf insulator bags.
2QZQ is a company that does alterations on Hennessy hammocks, adding zippers to the bottom entry designs, and they make under covers too. http://www.2qzqhammockhanger.com/hammockaccessories.html
Edited by dwambaugh on 04/25/2012 11:30:00 MDT.
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