Originally Posted by
hutzelbein
+1 to Dutch's suggestions.
I'm not familiar with JRB quilts, but if the suspension runs through channels and the quilt can be freely moved, it is likely that it suffers from the "accordeon effect". Due to its own weight, the quilt ends slide towards the lowest point (your butt), and an air pocket forms. That's the reason, why I added shock cords to the ends of all of my full-length underquilts. It's a bit annoying to have 4 suspension ends, but it helps with the sagging.
Should you have a double layered BB, get some Reflectix and cut out a square of the size of a sit pad. Put it between the layers where your butt is. I did this, and it helped a lot with whatever air pockets remained. You won't really feel much of the Reflectix, but it helps a lot.
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