Home / Shop / Saltwater / Fly Lines / DirectCore Flats Pro

THE VERY BEST FLATS LINE ON THE MARKET— perfect for bones, perms, and poons with low stretch performance

DirectCore Flats Pro


Conquer the flats with RIO’s FLATS PRO tropical saltwater line. This line has a mid length head and long rear taper for smooth, effortless loops, and a weight distribution that provide perfect presentations of just about any fly you are likely to use. The no-memory, easy to straighten, low stretch “DirectCore” is effortless to stretch out, lies completely straight on the water and gives unprecedented hook sets, while reducing the fight time. In addition, the hard, tropical coating stops the line from wilting in the heat, and ensures the line shoots with exceptional ease.

There are four different density options available that ensures any angler fishing the flats is covered for all conditions and species. The options available are:

  • F – A full floating line
  • F/I StealthTip – A full floating line with a 6ft clear intermediate tip - essentially a floating line with a really short, clear tip for the ultimate in stealth.
  • F/I – A floating line with a 15ft clear intermediate tip – perfect for getting the fly down in deeper flats
  • I – A full intermediate sinking tropical saltwater line

The core strength of this line is as follows:
  • WF6 - WF7 = 30lb
  • WF8 - WF9 = 40lb
  • WF10 - WF12 = 50lb



AgentX is a dual layered fly line that utilizes a high floating inner coating made with more buoyant microspheres covered by a tough outer coating for maximum durability.


DirectCore is RIO’s low-stretch core used in tropical lines. DirectCore stretches 30% less than other tropical cores, is exceptionally easy to pull coils out of, and lies exceptionally straight on the water.

Extreme Slickness

Extreme Slickness technology is a chemistry formulation that results in an ultra- slick line with dirt-repelling properties.

taper profile



RIO’s triple color line marking system that makes it easy to gauge distances and load, with a quick glance.


RIO’s printed line marking system that allows anglers to quickly and easily identify each line.

Front Welded Loop

A neat, bulletproof loop welded at the front of the fly line for fast rigging to a leader.

Back Welded Loop

A neat, bulletproof loop welded at the end of the fly line for fast rigging to backing.

DirectCore Flats Pro - All Models

Line ColorSink RateLine Size
Aqua/Orange/Sand Float WF7F
Aqua/Orange/Sand Float WF8F
Aqua/Orange/Sand Float WF9F
Aqua/Orange/Sand Float WF10F
Aqua/Orange/Sand Float WF11F
Aqua/Orange/Sand Float WF12F
Gray/Sand/Kelp Float WF6F
Gray/Sand/Kelp Float WF7F
Gray/Sand/Kelp Float WF8F
Gray/Sand/Kelp Float WF9F
Gray/Sand/Kelp Float WF10F
Gray/Sand/Kelp Float WF11F
Gray/Sand/Kelp Float WF12F
Aqua/Orange/Sand Float WF6F