As everyone who's followed us for any length of time knows, we love fishing big stonefly patterns, and it's for a good reason- they work. Picky fish? Try a big stonefly pattern. Low water? Try a big stonefly pattern. High water? Same, and the list goes on and on. Our new SYS Stonefly is a spin-off of our Two-Tone Stonefly Pattern, but we use a few different materials. We tested this pattern on the Provo and the Green Rivers this Winter with incredible success and we're confident that it will work anywhere trout eat stoneflies.