With the unrivaled success of the Amplitude Textured fly lines these new premium Amplitude Smooth lines are the industry leader in smooth lines. We took our patented AST Plus Slickness additive and put it into the brand-new Amplitude Smooth Series. While these lines are smooth like a traditional line, they have increased durability and slickness due to the proprietary AST Plus additive. This revolutionary material is integrated directly into our coatings that retains its slickness for the life of the line. Each line is built with three colors to identify the separate parts of the line, welded loops for quick and simple rigging and includes SA ID for easy line identification. Scientific Angler’s Amplitude Smooth lines are simply the highest performance smooth fly lines in the world.