RIO Premier Fathom 5 Fly Line
A complete series of sinking lines designed for easy distance and complete fly control, with ultra-slick performance.
Easy casting, fast loading head for minimum false casts and quick distance. Hang Marker shows where to fish the Hang. Density Compensation for complete depth control. Built on a supple core that will not tangle. Built with RIO’s exceptionally slick, durable SlickCast coating.
A COMPLETE SERIES OF SINKING LINES DESIGNED FOR EASY DISTANCE AND COMPLETE FLY CONTROL.
RIO’s Fathom lines are a series of sinking lines designed specifically for the lake angler. Each line has a short, quick-loading head for minimizing the number of false casts, and for quick, easy distance, and a color contrast between the head and the running line to easily show the line.
| Feature | Description |
|---|---|
| Hang Marker | Shows where to fish the Hang |
| Density Compensation | Provides complete depth control |
| Core Design | Supple core that will not tangle |
| Coating | RIO SlickCast coating for smooth performance |
FAQ
What makes the Fathom 5 line different from other sinking lines?
The Fathom 5 features a fast-loading head that reduces false casts and a clear color contrast between the head and running line, making it easier to see where the line is hanging in the water.
Does the line have any depth control features?
Yes, the line includes density compensation for complete depth control, allowing anglers to maintain consistent depth during fishing.
Is the line prone to tangling?
No, the line is built on a supple core that is designed to not tangle, ensuring smooth casting and handling.



Eric Young –
The Fathom 5 line casts smoothly and the hang marker helps me see exactly where the line is sitting. I’ve caught several fish in deep lake areas with this line. The SlickCast coating feels durable and doesn’t snag on rocks or vegetation.
Anne Ross –
Great for lake fishing. The quick-loading head makes casting faster and more accurate. I noticed the color contrast helps me track the line in murky water. A little more depth control than I expected.
Wanda Dyer –
I’ve used this line for several weeks now and it still performs well. The tangle-free core is a big plus when fishing in tight spots. The hang marker is very useful for adjusting depth.