Upavon Atomic Worm Chenille combines the soft, flexible construction of a worm material with vivid, mobile egg-style fibers — a hybrid material that reads as both worm and egg depending on how it's tied and fished, making it effective through a wide range of conditions and fish moods. Use it for San Juan Worm and squirmy-style patterns on trout, tie it into egg-worm hybrids for steelhead and salmon, or use it on stillwater worm patterns where the additional fiber movement gives the fly extra life on the pause. The vivid dyed colors hold well and the material performs in both still and moving water.