RIO MAINSTREM TROUT SERIES FLY LINE FLOATINGRIO Mainstream Series Fly Lines Designed for versatility and ease of use, the RIO Mainstream series is ideal for novice and average fly anglers looking for reliable performance across a wide range of freshwater fishing scenarios. These lines feature slightly heavier, shorter heads to enhance rod loading and improve casting efficiencyperfect for those still refining their casting technique or fishing in varied conditions. The short, powerful front