He doesn't have his site up yet. He is still in a fight over patents.
Here it is in the stuff sack provided:
There are four layers of synthetic sheet insulation (Climashield XP, I think) that are held in place with quilting loops. Only one layer is sewn to the shell (perimeter). Gives me the ability to add or remove layers of insulation by cutting the loops, then redoing the loops. I can access the insulation thanks to a handy dandy zipper on the butt-end. Since the layers aren't permanent, WBG recommends rolling, as opposed to stuffing, the UQ. It can compress down to about half the size you see here, but I'm trying to be nice to it.