This line has the same taper as the original but is upgraded with Airflo's Ridge Tech 2.0, which adds ridges to the surface of the line, reducing the amount of surface area in contact with the line, increasing casting slickness and distance. Long front taper for beautiful turn over. Longer head for control at distance. Smaller tip diameter for presenting smaller flies. Haul zone extends usable head length. Ultra-thin running line shoots like a dream, and takes up less spool space.

Airflo says:

Some fish are afraid of their own shadow. Others have seen every fly known to man. So when you're up against the absolute pickiest of eaters, it's time to get technical. The precision line that casts well on any action rod.