The Very Best Flats Line on the Market
Perfect for bones, perms, and poons.
Conquer the flats with RIO’s Flats Pro tropical saltwater line. This line has a mid length head and long back taper for smooth, effortless loops, and a weight distribution that provides perfect presentations of just about any fly you are likely to use. Each line is built on RIO’s low-memory DirectCore that is extremely easy to anneal (stretch) and lies perfectly straight on the water, yet retains the stiffness needed to cast in hot conditions. In addition, the line is built with SlickCast—the slickest, most durable coating on the market.
- Built with RIO’s exceptionally slick, durable SlickCast coating
- Low-stretch DirectCore for hard, solid strips
| Feature | Detail |
|---|---|
| Line Type | Flats Line |
| Coating | SlickCast |
| Core Technology | DirectCore |
| Head Length | Mid Length |
| Back Taper | Long Back Taper |
FAQ
What makes the Flats Pro line different from other flats lines?
The Flats Pro line features a mid-length head and long back taper for smooth loops, combined with low-memory DirectCore that stretches easily and maintains stiffness in hot conditions. It also uses SlickCast, a durable and slick coating for better performance and longevity.
Is the line suitable for saltwater fishing?
Yes, the Flats Pro line is specifically designed for tropical saltwater environments and performs well in harsh conditions.
Can this line be easily stretched and maintained?
Yes, the DirectCore technology allows for easy annealing and stretching, making it simple to maintain and use in various casting conditions.



Katherine Ince –
This line casts smoothly even in hot weather. The SlickCast coating stays clean and doesn’t snag easily. I’ve used it for both bone and perm flies and it delivers consistent presentations.
Rachel Manning –
Great for saltwater flats fishing. The back taper helps with loop control and the line holds its shape well. Easy to stretch and maintains stiffness when needed.
Liam McDonald –
Solid performance on the water. The coating feels smooth and durable. A bit more expensive than other lines, but the quality and consistency justify the price.
Nicholas May –
Perfect for long casts with minimal drag. The line stays straight and doesn’t kink. Works well with both light and heavier flies in tropical conditions.