As seen in Shimmy, Shimmy, Pow; Field & Stream article dating back to November 2013, and replicated by many, here is where to find the ones that swim properly.
Whether it's 2 or 3 sections, its a movement rich pattern for whatever you're chasing. The 2 section version comes in at roughly 4 inches and the triple is 5 and change. I have listed the five most popular colors that I fish myself, but I can and have used several others and will tie them upon request.
Reviews
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Hogsnare
Extremely deadly fly. Fished the double articulated version for big angry bull trout. Great action and solid tie. Thanks Rich.