No one, not even a trout can resist a sparkly dun. The CDC allows this fly to float low in the film and the biot ribbing makes for an accurate imitation of a naturals segmented abdomen. They lie flush with the surface and are easy to spot. In May through July, you’ll find trout feasting on sulphurs just before dusk. Compara-Duns are an excellent representation of a variety of insects.
CDC and a little sparkle makes for an accurate representation of a natural sulphur.