The Umpqua Kaufmann's Stimulator is a time-tested attractor pattern that can be used to imitate many different flies, just select the color that fits your needs. Dry flies are designed to be buoyant and float on the surface of the water. They represent the adult form of aquatic or terrestrial insects. These flies are used in a wide range of fisheries from streams and rivers to lakes. Dry flies are commonly used in a tandem rig, with a second fly trailing behind using a section of tippet. There is nothing more exciting than getting a trout to take a fly off the surface.