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Scientific Anglers(TM) Technology

Advanced Taper Design

Innovations that you can feel with every cast.

How a fly line is shaped determines its performance through the air, with the line's taper affecting how energy is transmitted and dissipated. Varying the lengths and diameters of the various parts of the fly line (shown at right) allows us to control this energy, resulting in accentuated performance characteristics for specific types of fly fishing. It's a system Scientific Anglers™ has both pioneered and perfected.

Taper structure

Basic tapers

The pioneering work of 3M Scientific Anglers™ over the last half century is responsible for the great breadth of tapers available in fly fishing today. We have made a science out of engineering the ideal shapes for specific fishing applications, giving you more and better choices for more fly fishing success:


Freshwater lines vs saltwater lines

Taper designs are only one of the many differences between freshwater and saltwater lines. And though you can use both types of lines in both environments, you cannot expect to achieve best results with a line not specifically designed for the conditions. Scientific Anglers™ freshwater and saltwater lines are designed with unique attributes that allow them to achieve optimal performance for specific applications. Here are some general comparisons.

  Freshwater Saltwater
Tapers Available in a variety of designs with different advantages, including tapers for finesse, distance, power, and general performance. Typically designed for quick, accurate casts and maximum distance.
Cores Available with cores that perform well in all conditions, including stiff cores for warm water and cores with low stiffness qualities for cold spring creeks. Although available with cores with low and moderate stiffness, many saltwater lines have a very stiff core that helps the line remain functional in hot tropical conditions.
Diameters Because freshwater is less dense than saltwater, freshwater lines are typically made with larger diameters, and lower line density, to improve floatation. This also requires specialized tapers to enhance casting. The density of saltwater allows us to create lines with smaller diameters, and therefore greater densities, without losing floatation qualities. The smaller diameter also allows easier casting in wind.

Read about L2L Reconnect.