Since I didn't drive on the way over, and the dealership insisted on making me wait while they washed my new used car (in spite of it being already cleaner than any car I'd driven in at least ten years), I also came home with this:
So what's so great about these yarns? The thing they all have in common is that they all have three or more plies, which makes them "round." With fingering weight yarns, there are a lot of round choices, but lace yarns are frequently two-ply. Sometimes the structure of two-ply yarn obscures the structure of the crochet stitch. This can be a good thing with very simple stitch patterns, but if I'm going to the trouble of designing complex new edgings (which I am), I jolly well want every detail to show up.