From RIO:
RIO brings multi-density lines to anglers looking to fish with big flies or heavy sink tips, with its award-winning InTouch Big Nasty Sink Tip series. With both 3D and 4D options, anglers can reach waters infrequently touched.
The InTouch Big Nasty Sink Tip lines are multi-density sink tip lines designed to cast large and heavy flies thanks to its front-loaded weight distribution and ultra-low stretch ConnectCore. The seamless blend of three or four densities ensures a smooth transition of energy when casting and the best depth control while fishing. It is available in float/hover/intermediate (F/H/I) that is ideal for fishing in the top two feet of the water column, float/hover/intermediate/sink 3 (F/H/I/S3) ideal for fishing 2-4 feet in depth, and a float/intermediate/sink 3/sink 5 (F/I/S3/S5) perfect for fishing between 4-8 feet in depth.
These lines won the 2018 IFTD award for Best Freshwater Fly Line, so pick one up at your nearest RIO dealer for $99.99. The lines come in gray/green/orange for F/H/I, black/gray/green/orange for F/H/I S3, and the F/I/S3/S5 comes in black/dark gray/light gray/orange.