Rio InTouch Big Nasty Freshwater Fly Line
The InTouch Big Nasty is designed specifically to cast large and heavy flies with exceptional ease. It features a short, powerful front taper that handles weighted streamer and large terrestrial patterns without issue. The line is heavier than industry standard, allowing for quick loading of modern fly rods.
Built with RIO’s ultra-low stretch ConnectCore technology, it delivers minimal stretch and maximum performance. It includes RIO’s XS and AgentX technologies for improved casting and line behavior. Both ends feature welded loops for secure connections.
The glow-in-the-dark LumaLux version is ideal for night fishing, especially when casting hex patterns or during low-light conditions.
Sink Tip Series
Perfect for anglers who frequently use sink tip rods and need a line that performs well with heavy flies.
| Feature | Specification |
|---|---|
| Line Type | Freshwater Fly Line |
| Weight | Heavier than industry standard |
| Taper | Short, powerful front taper |
| Technology | ConnectCore, XS, AgentX |
| Ends | Welded loops |
| Special Version | LumaLux (glow-in-the-dark) |
FAQ
What makes the Big Nasty line better for casting large flies?
The short, powerful front taper and heavier weight allow for quick loading and smooth casting of large, weighted flies like streamers and terrestrial patterns.
Is the LumaLux version suitable for night fishing?
Yes, the glow-in-the-dark LumaLux version is specifically designed for night fishing, making it easier to see and cast hex patterns in low light.
Does the line have any special features for sink tip rods?
Yes, the Big Nasty is optimized for sink tip rods, offering excellent performance when casting heavy flies with these rods.

Brandon Jackson –
I’ve been using the Big Nasty for several weeks now and it’s a game-changer for casting large streamers. The front taper is strong and the line doesn’t stretch much, which helps with accuracy. The welded loops are secure and easy to attach. I especially like the LumaLux version for night fishing—it’s visible in the dark and makes casting hex patterns much easier.
Owen Bower –
This line performs better than my previous one when throwing heavy flies. The AgentX technology helps with line control, and the ConnectCore gives a solid feel. I use it with a sink tip rod and it loads quickly without tangles. Great for big terrestrial patterns.
Lily Howard –
The casting performance is excellent, especially for large flies. The line feels sturdy and doesn’t stretch much. The only minor issue is that it’s heavier than standard lines, which might not suit all rod setups. Still, it’s worth it for serious fly fishing.