Rio Mainstream Series TroutThe Rio Mainstream Series Trout fly line is designed for the everyday fly fisher who wants a versatile, easy casting line that handles a wide range of trout fishing situations without compromise. Slightly heavier than standard weight forward lines, the Mainstream loads rods quickly and turns over leaders with authority whether you're drifting dry flies on a riffle, indicator nymphing a deep run, or throwing a light streamer to a cutbank. Slightly