The Scientific Anglers Amplitude Infinity Fly Line redefines versatility and performance for freshwater anglers. Featuring the revolutionary AST Plus slickness additive, this premium line shoots farther, mends smoother, and lasts longer than any other fly line on the market. Built a half-size heavy with a long head and refined front taper, it delivers flawless presentations across all styles—from delicate dry flies to heavy streamers. Whether targeting trout, panfish, or steelhead, this line does it all.
The Amplitude Infinity features Floating Texture technology for unbeatable flotation and Shooting Texture for reduced friction and maximum casting distance. Its extended head design offers precise control for mending and long-distance delivery, while the Tactile Reference Point provides a smooth transition you can feel for perfect timing and accuracy. With welded loops for quick rigging and SA•ID line identification printed directly on the tip, every detail is engineered for anglers who demand performance and reliability.
| S/A AMPLITUDE INFINITY | ||||
| Line Weight | Head Length | Total Length | Head Weight | Grain Weight* |
| WF3F | 47.0' | 90.0' | 155gr | 110gr |
| WF4F | 48.0' | 90.0' | 190gr | 130gr |
| WF5F | 49.0' | 90.0' | 225gr | 150gr |
| WF6F | 50.0' | 90.0' | 260gr | 175gr |
| WF7F | 51.0' | 90.0' | 305gr | 200gr |
| WF8F | 52.0' | 90.0' | 350gr | 225gr |
*First 30' of fly line
AST+ - A new formulation of S/A's patented dry-slick technology provides continual line slickness over the lifetime of the line. Up to 50% slicker than the original AST and 200% more durable than the competition. Fly lines with AST Plus cast farther, float higher, and stay cleaner than any other lines ever built.
Floating Texture - Featuring microreplication technology, the SA Floating Texture is a radical modification of typically smooth-surfaced fly lines. Its microtextured surface traps air to provide superior shootability and flotation while eliminating line flash and vastly reducing friction. Lines sit higher in the water, offering less drag and water spray, as well as easier mending, roll casting, and pick-ups.
Shooting Texture - The Scientific Anglers Shooting Texture features precisely replicated hemispherical divots, similar to those found on a golf ball’s surface. This evolution of our texturing technology has less texture on its surface so it feels like a traditional fly line but performs with the benefits of texturing. The result is a line that lasts longer, floats higher, casts easier, and, most importantly, fishes better.
Welded Loops - Exceptionally slick and strong, S/A's Welded Loops produce smoother casts and easier turnover with a seamless fly-line-to-loop transition, making for softer landings and cleaner pickups. The sleek design also maintains buoyancy for improved fly-line flotation and enables quicker connections between fly line and leaders or fly line and backing.
Improved Dry Tip - Utilizing a unique blend of microballoons, we have developed a fly-line tip section that floats twice as high as a standard line. The tip section will be floating higher with our Dry Tip Technology, which means less drag from the front of the line and more positive hook-ups.
SA Line ID - Meet the Scientific Anglers Line Identification System. SA•ID is an innovative line-marking system allowing you to identify your lines at a glance. Wonder if a shooting head is 200 grain or a 300? Just look at the SA•ID. The SA•ID can be found on the first 1-2 feet of the tip section of your line.
TRP - The Tactile Reference Point is a non embossed section of line where the end of the head meets the running line. This allows you to feel—and hear—the transition from our textured technologies.
Camo - Camo technology creates a stealthy blend of muted colors on fly lines, providing much-needed stealth for wary fish, low-water situations, and any time an additional bit of deception is necessary.
