Spey fly lines, and the rods that cast them, offer many potential advantages: greater casting distance, greater line control, more precise mending at longer distance, and the ability to operate with little back-casting room. These tools enable an angler to cover more water with less effort and less fatigue. And on larger rivers, you can reach areas that would be virtually unfishable with single-handed lines and rods. Learn more about these recent innovations in Understanding Spey Fly Lines by RIO's own Simon Gawesworth.