Scientific Anglers - Sonar Saltwater Intermediate Fly Line

The Scientific Anglers Sonar Saltwater Intermediate fly line has been updated and upgraded for the 2026 season. Now sold in full clear!

It’s not very often you’ll need to fish topwater flies in the salt. That’s where an intermediate line comes in handy. The SONAR Saltwater Intermediate fly line features a slow-sinking clear head that cuts through the surface and provides an amazing amount of stealth for those wary fish cruising the flats. From redfish and bonefish to permit and tarpon, give yourself an edge that fish won’t be able to see. One of our favorite and best selling lines for Tarpon and a variety of other species.

The SONAR Saltwater Intermediate fly line features a slow-sinking clear head that cuts through the surface and provides an amazing amount of stealth for those wary fish cruising the flats. From redfish and bonefish to permit and tarpon, give yourself an edge that fish won’t be able to see.

* Slow sink rate gets flies just below the surface
* Engineered for use in salt water
* Tropi-Core technology for tropical climates
* Sink Rate: 1.25 ips (Intermediate)
* SA ID – SA SONAR SWTI WF X I (X = line weight)
* New color for 2026 is Clear

Features: SA Line ID, AST, Sonar, Welded Loops, TropiCore

Scientific Anglers Sonar Saltwater Intermediate Fly Line- sold here in line weights 7-12

Grain Weights:
7wt = 200 grains  38' head length
8wt = 225 grains  38' head length
9wt = 260 grains  38' head length
10wt = 305 grains  41' head length
11wt = 335 grains  41' head length
12wt = 415 grains  41' head length