How To Fish It: In addition to hatch-matching situations, the CDC and elk also a great search fly for calm water, since the CDC fibers catch a ton of air, which makes for soft landings. Coupled with a tuck cast and an extra foot of tippet, this thing touches down as lightly as any feather out there. That said, it's definitely not just a calm-water fly. If you don't think of CDC as a viable rough-water floatation agent, think again. I've fished alongside anglers on brawling mountain rivers in Europe who were crushing fish on CDC and CDC caddis (CDC body, CDC wing). Learn to use this fiber and you'll catch more fish.