Scientific Anglers Sonar Stillwater Seamless Density Fly Line - Dark Green / Charcoal

Scientific Anglers Sonar Stillwater Seamless Density Fly Line - Dark Green / Charcoal is a double-density sinking fly line built for stillwater anglers who need better depth control and a straighter connection to subsurface flies. This Sink 3 / Sink 5 configuration uses Scientific Anglers' Seamless Density technology to create a smooth transition between the running line and head, helping reduce hinging while improving strike detection, line control, and fly tracking below the surface.

Key Features

• Seamless Density Design: Smooth density transition keeps the line tracking straighter for more consistent presentations and better contact with your fly.
• Stillwater-Specific Taper: Based on the popular MPX taper and overweighted by two line sizes to turn over multiple flies and long leaders with confidence.
• Built-In Performance Details: Includes textured 10-foot and 20-foot hang markers, SA Line ID, and welded loops for quick rigging and easier line identification.

The Dark Green / Charcoal Sink 3 / Sink 5 version is ideal for searching the middle of the water column when trout are feeding below the chop but not pinned to the bottom. Scientific Anglers designed this line for lake fishing situations where controlled sink rate, clean turnover, and dependable depth coverage matter most. Whether you are fishing chironomids, leeches, or small streamers, this line helps keep your presentation in the strike zone longer.

Each line features a 35.5-foot head and 105-foot total length. Available here in WF-5-S and WF-6-S, this Scientific Anglers fly line is a strong choice for freshwater trout anglers looking for a reliable full-sinking stillwater setup.