Sci Angler Sonar Sink 25 Cold Fly Line
When it comes to fishing streamers in cold water, it’s difficult to beat the SONAR Sink 25. Designed with a short 25′ fast-sinking head, the Sink 25 sinking fly line gets flies deep extremely quickly and is paired with a large diameter handling section for excellent line control. When it’s time to get down and dirty, the Sink 25 has your back.
- 25’ extra-fast sinking head with handling line
- For coldwater applications
- An excellent streamer line
- Low tangle design increases shooting distance
- Floating running line
- Super Fast Sink: 4.0 – 8.0 ips, sinks 4’ – 15’
- Braided multifilament core
- SA ID – SA SONAR SINK 25 ### (### = grain weight)
| Feature | Detail |
|---|---|
| Sinking Head Length | 25 feet |
| Sinking Speed | 4.0 – 8.0 ips |
| Depth Range | 4’ – 15’ |
| Core Type | Braided multifilament |
| Running Line | Floating |
| Application | Coldwater streamer fishing |
FAQ
What is the sinking speed of the Sci Angler Sonar Sink 25?
The Sonar Sink 25 sinks at a speed of 4.0 to 8.0 inches per second (ips).
Is the line suitable for cold water fishing?
Yes, it is specifically designed for cold water applications and performs well in low-temperature conditions.
Does the line have a tangle-resistant design?
Yes, the low tangle design helps increase shooting distance and improves casting performance.



Alison Scott –
Used the Sonar Sink 25 in a cold stream and it got my flies to the bottom quickly. The sinking head is short and effective, and the handling section gives good control. No tangles during casting, which made a big difference in my accuracy.
Joseph Berry –
Felt like a solid choice for cold water streamer fishing. It sinks fast and stays stable. The floating running line helps with casting, and I appreciate the low tangle design for longer casts.
Maria Murray –
Great for deep water fishing in cold streams. The 25-foot sinking head reaches the bottom fast, and the braided core feels strong and durable. Easy to handle and works well with streamers.