I literally have been developing this fly for 20 years. It took me that long to find a fly that always worked in most of the stages of a midge nymph and to find the perfect combination of materials. This is my go to fly when i can’t get a fish to rise. i use it as the top fly in a 2 nymph rig. it’s also perfect to hang under a huck hopper in moving water scenarios. The size 16 bigger size is perfect for rivers. in still water, the 18 & 20s work great.
Almost every river around the world has midges and they hatch year round. Out in the eastern sierras on Crowley Lake in a float tube, where i cut my chops, i would watch the midges come up to the surface, sprout wings and fly away for hours on end. but, more times than you’d think i’d watch a cripple fail to launch, ultimately sinking back to the depths to be consumed.