RIO Grand® Fly Line The RIO Grand is state-of-the-art in fly line technology with distinctive benefits for the trout fly fisher. The tip floats extremely high due to RIO's proprietary manufacturing process, yet gives a smooth light delivery of even the smallest dry fly. The weight forward taper features a slightly heavier load to activate the faster modern fly rod, yet the rear taper is long enough for roll casting. The line is the product of RIO's SlickShooter™ Process and incorporates a supple coldwater, super slick, self-lubricating, dirt-resistant coating on a nylon multifilament core. This is the perfect line for wet or dry fly fishing. RIO has included a welded loop on the front end of the fly line to facilitate changing leaders. In all our tests we have found excellent turnover and presentation with this loop. When landing fish, it slides through the rod guides more easily than the customary nail knot. Traditionalists can cut this loop off and not compromise the taper.