I tried all the hiking pads in my arsenal and found them all uncomfortable and pretty much useless as they are 20" wide. I did some surfing on convoluted surface foam, hoping to come up with the OCF stuff used in the Hennessy SuperShelter. I stumbled on the Coleman 892B247 blue foam sleeping pad that is 24"x72"x5/8".
I dumped it in my Grand Trunk Ultralight for a test. When I first got in, I had some buckling in a couple spots, but after some major wiggling and tweeking, I actually got it to take a curve. It wasn't the silky experience of laying directly on the GTUL fabric, but I could see spending a night on it. It just covers my hips and shoulders and it is stiff and thick enough that any side insulation from quilt or sleeping bag will have chance.
The corners stuck out and were just excess baggage, so I hopped in with a felt tip marker and made a rough outline the areas to be trimmed. I narrowed the leg area a bit and rounded the corners, with a mind to keeping the outboard corner so that I had good heel coverage. I heavily rounded the top corners. It was easy to cut with a pair of Fiskars scissors and I tapered all the cuts to give smooth lines.
It turned out pretty good and it still very usable for a ground pad. It does take some wrasslin' to get into a good position, but not impossible. I found that I needed to place it a lot higher to the head end than I expected to have it end up in the right place when I was settled in. It is stable and warm enough for any summer adventures. I did find that a flatter hang worked much better.
It is bulky when stowed-- 24"x8"--- but the surprise is that it is much lighter than expected. The listed weight is 1.5 pounds and actually 12.6oz out of the box and 11.5 after trimming. That is a very respectable weight for a full length sleeping pad. For comparison, my Therm-A-Rest Prolite small-size inflateable pad is 11oz and just 20"x47". I did not find an R-value listed for it, but 5/8" CCF has to be good. It came with two wide elastic bands and I found that just one was good for keeping it rolled.
So, not as comfy as insulation below the hammock surface, but usable and serviceable. I got it on line at http://www.meijer.com/s/coleman-conv...pad/_/R-151288, for $19.65 + tax and $3.95 shipping. Service was good.
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