RIO Premier Fathom 7 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 the fishing depth for easy target identification |
| Density Compensation | Provides consistent depth control throughout the cast |
| Fast Loading Head | Minimizes false casts and enables quick distance |
| SlickCast Coating | Durable, ultra-slick surface for smooth performance |
| Supple Core | Prevents tangling and maintains line flexibility |
FAQ
What makes the Fathom 7 line different from other sinking lines?
The Fathom 7 features a fast-loading head, density compensation, and a visible hang marker to help anglers maintain depth control and easily track the line during casting.
Does the line have any special coating for performance?
Yes, it is built with RIO’s SlickCast coating, which provides a durable and ultra-slick surface for smooth casting and reduced friction.
Can I use this line in deep water conditions?
The density compensation system allows for consistent depth control, making it suitable for use in various water depths.



Lily Fraser –
The Fathom 7 line casts smoothly and stays on target. The hang marker helps me see exactly where the line is sitting in the water. I’ve used it in both calm and moving lakes and it performs consistently.
Max Vaughan –
Great for lake fishing. The quick-loading head reduces false casts, and the color contrast makes it easy to track the line. I appreciate the supple core—it doesn’t tangle even after long use.
Michael Mitchell –
Solid performance overall. The depth control is reliable, and the line feels smooth in the hand. A bit more expensive than others, but worth it for the precision and ease of use.
Anne Gray –
I’ve switched from another brand and this line has improved my casting accuracy. The hang marker is a small but useful feature that helps me adjust depth quickly.