Caddis adults are often found in fast riffles, and when targeting fish in these situations you want a fly that will float well, is easy to see and still be an excellent representation of an adult fly. RIOs Foam Run Caddis offers a realistic cylindrical body that happens to be foam, with a tapered butt for even more realism. Its two-tone poly wing looks realistic to the fish and makes it super easy for the angler to see.