I use the "underblanket" from DD Hammocks. (Same thing; different name.) Tested it down to the mid-20s F with my GTSBP and I was fine after getting it adjusted.
The DD under quilt has lanyards on the side of it for attaching it to their DD hammocks. Can't use those lanyards on SKP (nothing on SKP to tie to) but the attachment of them aren't really needed anyways. Hammock sits down into quilt just fine.
http://www.ddhammocks.com/product/dd-underblanket
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