This is one of the best fish-catching flies around, and one that should be in every fly box. It imitates many insects, such as Grasshoppers, Stoneflies and Drakes, but can equally work as a general attractor for when searching for cruising and rising fish.  The double wing looks like a fluttering insect, while the foam body and poly-wing hold floatant well - making it an excellent choice for trailing a dropper.