Upavon Synergy Flash combines colored soft yarns with UV and metallic fibers in a single material — producing a layered color effect that shifts on the retrieve in a way solid flash or plain tinsel doesn't replicate. Use it as a body material on streamer and lure patterns, wrap it as a rib over darker dubbing on nymphs and wet flies, or blend it into dubbing loops for thorax and collar work where you want flash built into the fiber rather than tied in separately.