Chou's Double Agent Steelhead Nymph
Double Agent Fly, Green and Black
The black/green combo is the original version that is used when either fishing over spooky fish in gin clear conditions or when trying to actually mimic an existing aquatic food source. It has also worked great as trailer to a larger fly when either nymphing or even stripping a streamer/soft hackle setup.
Double Agent Fly, Red and Black
In an effort to increase the visibility and contrast of this fly, an orange bead and wire were added, while still keeping the black collar and tail. For me, it falls under the "small buggy profile with a little more cowbell" category that I'll use in slightly colored water when a larger profile fly feels like too much.