An ISO nymph that works well for the larger ISO’s. Currently we are offering this fly in a size #10 and #12 on a 2.8 tungsten bead. The Iso Sexy works dead drifted or on the swing. This accounted for a lot of large browns during and right before a hatch.
In low flows throw this fly as your anchor in fast water. In more aggressive flows it can be used as a dropper fly. Iso's often migrate close to the banks in well oxygenated water, so don't neglect the skinny swifter water. When the Iso's start popping throw this where the alpha holding water is.