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

SA Sonar Saltwater Intermediate 7wt WF-I
* 30' Head Weight: 200 grains
* Total Head Weight: 215 grains
* Head Length: 37.5 feet
* Total Length: 105 feet

SA Sonar Saltwater Intermediate 8wt WF-I
* 30' Head Weight: 225 grains
* Total Head Weight: 265 grains
* Head Length: 37.5 feet
* Total Length: 105 feet

SA Sonar Saltwater Intermediate 9wt WF-I
* 30' Head Weight: 260 grains
* Total Head Weight: 330 grains
* Head Length: 37.5 feet
* Total Length: 105 feet

SA Sonar Saltwater Intermediate 10wt WF-I
* 30' Head Weight: 305 grains
* Total Head Weight: 415 grains
* Head Length: 40.5 feet
* Total Length: 105 feet

SA Sonar Saltwater Intermediate 11wt WF-I
* 30' Head Weight: 355 grains
* Total Head Weight: 510 grains
* Head Length: 40.5 feet
* Total Length: 105 feet

SA Sonar Saltwater Intermediate 12wt WF-I
* 30' Head Weight: 415 grains
* Total Head Weight: 620 grains
* Head Length: 40.5 feet
* Total Length: 105 feet