Originally Posted by MAD777
Although I haven't tried one of these designs, that hasn't stopped me from thinking about it. The biggest challenge I see is that hammocks stretch a LOT, which has the potential to compress the insulation. Therefore, I would consider making the hammock out of the least stretchy material that you can find. Perhaps a thicker polyester, instead of nylon.
Of course, that would add some weight, so I guess the quest to develop the perfect hammock continues.
Right you are! My first insulated hammock was made with Supplex top and 1.1 ripstop bottom. It had longitudinal baffles, and I didn't calculate sufficiently for the stretch of the load-bearing Supplex. Before I stuffed it I tested it out and found my weight (150 lbs.) changed the distance between layers from 3" to 1/4".
I improvised and threaded 6" wide strips of Reflectix into the channels. It worked great, was very comfortable, but didn't compress at all. Later I took it apart and added wider baffles and extra strips at the edges to make the bottom layer much larger. This worked, and I stuffed it with down. Since then I've learned to calculate how much the top layer will stretch and compensate ahead of time. (It ain't easy, but can be done.) By the way, sewing baffles to the top layer can be problematical. Threads break with use (though the hammock works fine despite some loosened baffles). A line of needle holes can weaken lightweight fabrics, too.
I think these challenges can be met. I also think Primaloft is a good choice of insulation, though Climashield is also good, and down is great. I've made hybrid hammocks with a synthetic layer + down.