A good Nymph and Indicator line needs to be able to form efficient loops that can straighten out heavy flies and large indictors. Kelly's new line has a larger tip diameter and more aggressive front taper to handle even the heaviest junk.
Even with a good cast, many struggle mending the line and controlling the drift. But, the Super-DRI Nymph / Indicator has an extended rear taper and a high floating front section to help mend and manage the line better than any Airflo have ever made.
With Airflo's original low stretch power core you'll be able stick fish at distance and with its Ridged surface, the line won't slip out of your hand while doing so.