Not to burst your bubble but we already have this...it's called a quilt that is not fitted to the hammock properly. The air is slow to heat up on its own, does not stay warm well and generally leaves the user colder than if the quilt does not have any space between the user and the insulation. Many folks have exspecialy fed a cold night with their quilt drooping ever so slightly away from the bottom of the hammock while the perimiter edge is holding in place well.
As well the Karo style quilt does not really prevent all down shifting it allows for down shifting so that you can move down around in the quilt to where you want it most. Say your feet or core gets cold...a few pats or a little shake and you have moved some of the volume of down from one area to another.
Great work thinking outside the box, keep it up. That's how new ideas work. Unfortunatly air on its own is not a great insulator and heat readily passes through. Down or other insulations are used to slow this transfer of heat.
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