SA Sonar Sink 25 Cold S3

Scientific Anglers Sonar Fly Lines are built for the 90% of feeding that happens below the surface. With multiple sink rates and densities, they let you place streamers, chironomids and larger predator flies exactly where the fish are holding, from just under the film to serious depth.

The Sonar family covers a wide range of line weights and water temperatures, from early season cold to tropical heat. Many models use the Titan Taper, which loads rods quickly and turns over heavy or wind-resistant flies with control. AST coating keeps the line slick and durable, while Welded Loops make leader changes straightforward and SA ID helps you identify the line at a glance. Single-, dual- and triple-density options give smoother sink profiles, better bite detection and more direct hook-sets.

• Designed for subsurface fishing in rivers, lakes and coastal water
• Available in multiple sinking densities and sink rates
• Titan Taper options for fast loading and easy turnover
• AST coating for improved slickness and longevity
• Welded Loops for quick leader attachment
• SA ID for easy line identification on the reel
• Works across a broad range of water temperatures
• Triple-density 3D Sonar Titan models reduce line sag and improve contact