This is probably the most popular fly designed by Sierran Flyfisher, Ralph Cutter, and introduced to the public in 1981. The E/C Caddis is an emergent/cripple caddis pattern developed for the Large caddis hatches on the Truckee River. However, this fly works great during the majority of caddis hatches. If you are going to be fishing caddis dries or emergers, then these should have a presence in your fly box.