I went with the 1.1 double layer, mostly for versatility. I'm living nomadically while traveling this winter and use a Warbonnet torso UQ with two layers of insulation quilt looped in. Rather than carry the bulky and fragile extra insulation layers to be optionally sewn in with quilt loops, with the double layer I have the option of adding a pad if I run into some cold nights. Carrying the pad around also gives me the option to go to ground if need be.
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