Scientific Anglers Sonar Uniform Sink 2

The idea behind the graduated densities of the SONAR Uniform Sink sinking fly line is a brilliant one: instead of a single density that can sink at an uneven rate due to the fly, the front of the Uniform Sink lines sinks faster than the rear, all but guaranteeing a straight-line connection to the fly. In stillwater and lake fishing situations, this is a must-have, non-negotiable, fish-catching attribute.