The Iris Caddis in olive imitates a variety of different caddisflies in their pupa and emerger stages. A truly versatile fishing fly, this pattern can be left to sink and swung through the water like a nymph or left to float in tight nooks and crannies. A row of Iris Caddis is essential to a good day during the caddis hatch. The olive coloring works just about anywhere and is a good fly to try first during the hatch.