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Scientific Anglers
Amplitude Smooth Infinity Taper Fly Line

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Amplitude Smooth Infinity Taper Fly Line

Conventional thinking says that there's no such thing as a true "all-purpose" fly line, but the Scientific Anglers Amplitude Smooth Infinity Taper Fly Line begs to disagree. It has the power to deliver long streamer casts, yet retains a delicate touch when throwing out dry flies. It also mends effortlessly and can drop flies at any distance. Constructed a half-size heavy, with a long head and substantial front taper, it’s ideal for everything from cutthroat and bass to muskies and salmon. It's no wonder that Scientific Anglers chose to call it the Infinity—there's no end to what you’ll be able to do with it.

Scientific Anglers' Amplitude Smooth series of lines set a new standard for smooth fly line performance. They offer five times less drag and eight times more durability than traditional fly lines, meaning ultra-smooth performance that's built to last.


  • All-purpose freshwater line that can handle any type of fishing
  • AST Plus slickness for superior shooting ability and durability
  • General-purpose taper works on everything from panfish to pike
  • Made a half-size heavy to load fast-action rods
  • Extended head length for long-distance casting and enhanced mending
  • Excellent for dry flies, streamers, and nymphs in moderate-to-cold water
  • Item #SAS003L
braided monofilament
Overall Length
Fly Line Weight
WF-4-F, WF-5-F, WF-6-F
Fly Line Style
Taper Design
general purpose
Recommended Use
river fishing, stillwater fishing