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EASY CASTING, QUADRUPLE DENSITY SINK TIP LINE, designed specifically to cast large and heavy flies

InTouch Big Nasty 4D Sink Tip F / H / I / S3


RIO’S INTOUCH BIG NASTY SINK TIP line is the perfect sink tip for casting large streamers, with a front-loaded weight distribution that easily casts the biggest of flies. The line features RIO’s Multi Density Control - a seamless blend of four densities that ensures the smoothest transition of energy when casting, and the best depth control when fishing. It is made with an ultra-low stretch core for the maximum in sensitivity and performance. This is the easiest casting, fishiest sink tip line ever made.

The F/H/I/S3 is perfect for getting flies down to 2-4 feet in depth.

The INTOUCH BIG NASTY SINK TIP is also available in the following options:

If you are looking for a floating line to cast big flies, you will do no better than the INTOUCH BIG NASTY floating line, which can be found here

taper profile



ConnectCore is RIO’s ultra-low stretch core (maximum 6%) used in coldwater fly lines that provides incredibly sensitivity and control when casting and fishing.

Extreme Slickness

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

Multi Density Control

Multi Density Control is a combination of different density sinking coatings in a single line that gives anglers complete depth control and perfect contact with the fly


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.

Density Compensation

Adds a denser material to the thin tip of a sinking line (or sink tip), which ensures the line sinks straight.

InTouch Big Nasty 4D Sink Tip F/H/I/S3 - All Models

Line ColorSink RateLine Size
Black/Gray/Green/Orange Float/1ips/2ips/3ips WF5F/H/I/S3
Black/Gray/Green/Orange Float/1ips/2ips/3ips WF6F/H/I/S3
Black/Gray/Green/Orange Float/1ips/2ips/3ips WF7F/H/I/S3
Black/Gray/Green/Orange Float/1ips/2ips/3ips WF8F/H/I/S3
Black/Gray/Green/Orange Float/1ips/2ips/3ips WF9F/H/I/S3
Black/Gray/Green/Orange Float/1ips/2ips/3ips WF10F/H/I/S3