DemostiX--perhaps. But...
JRB gets huge points for realizing the potential for down quilts under hammocks, an insight around which they built a great business. I learned about hammocking seeing pictures on their website of their quilts under Hennessy hammocks. BUT perhaps you have to have lived with the necessity of fidgeting with the tension to avoid compression on a "flat" quilt---which for quite some time was all that was available from JRB or anyone else---to appreciate the comparatively no-nonsense approach possible with a differential cut. So fine, the idea of shape forming fabric existed long before underquilts, and the SnugFit was an application of it. That's where genius lies usually, in making connections, bringing insights from one domain into another. Einstein couldn't have expressed general relativity without the already-developed (and at the time greatly under-appreciated) concepts of Riemann's non-Euclidean geometry.
Another point of genius is realizing that the same effect can be had with much less effort in darting, and those points go to JRB, for when they introduced their differential cuts, that design was a great deal simpler then Youngbloods, which translates into lower cost and greater access by the consumer. The other differential cut quilt makers have followed that lead.
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