Scientific Anglers Amplitude Textured Infinity Fly Line

When it comes to versatility, there’s hardly a freshwater situation Scientific Anglers' Amplitude Textured Infinity Fly Line can’t handle. From drifting small terrestrials under the willow boughs to turning over weighted streamers in deep pools, this line is built for anglers who need to do it all. Featuring Scientific Anglers’ revolutionary AST Plus additive, the Infinity shoots farther, lasts longer, and maintains that just-out-of-the-box slickness for seasons to come. With a long head, balanced taper, and half-size heavy build, it’s designed to load rods efficiently, mend effortlessly, and deliver a wide range of fly patterns and types at any distance with confidence. Made in line weights 3 through 8, you can count on the Amplitude Textured Infinity whether you're working dry flies in pockets in an alpine stream, drifting eggs for Lake Erie steelhead, or stripping streamers in search of strong bronzebacks.

Features

AST Plus Slickness Additive – Scientific Anglers’ most advanced coating technology, AST Plus reduces drag and keeps your line shooting clean and fast, even after seasons of use. It’s up to eight times more durable than standard lines, ensuring consistent performance every time you reach for it. You’ll notice smoother casts, higher flotation, and effortless line pickup, whether fishing 20 feet out or across the far seam.

Improved Dry Tip – A key advantage when fishing dry flies, this enhanced tip section floats higher than standard lines, helping you stay connected to your fly and make faster, more accurate hooksets when those subtle takes happen.

Welded Loops – Welded loops on both ends of the line simplify rigging. Quickly attach backing or leaders without compromising strength or turnover, so you can spend more time fishing and less time retying.

SA Line ID – Easily identify your line with a quick glance thanks to SA's Line ID. Scientific Anglers’ integrated Line ID system takes the guesswork out of switching spools or setting up rods—especially handy if you rotate between weights or line types or plan to fish multiple techniques in the same day--think streamers on a sink tip in the morning, hoppers along the banks in the afternoon. .

Floating Texture – SA's Floating Texture Tip utilizes a microreplication technology that creates a microtexturing to the line's tip. The textured surface on the tip section dramatically improves flotation, helping your dry flies ride higher and longer on the surface film. It also improves line pick-up, keeping you in control for quick, accurate second casts to feeding fish.

Shooting Texture – SA's Shooting Texture technology is made up of tiny hemispherical divots along the line. The micro-textured running line minimizes friction through your guides, resulting in noticeably longer casts with less effort. It’s that extra edge when you need to reach across big water or cover more distance in the wind.

Uses

Dry Flies, Nymphs, Wet Flies, Streamers, and Poppers - True to its name, the Amplitude Textured Infinity is built to handle any fly you can throw at it. It’s perfect for trout, bass, grayling, and panfish, but can just as easily chase carp, pike, or even steelhead when the opportunity strikes. This is the line for anglers who want to carry one setup that can do it all while presenting a wide variety of fly patterns and types. From rolling nymphs to mending dry flies and all the way to swinging wets and stripping streamers, you can rely on the Amplitude Textured Infinity Line for it all. 

 

Temp

Cold to Moderate - Engineered for performance across a wide range of freshwater environments, the Infinity stays flexible in cold mornings and won’t wilt under moderate summer heat. From mountain streams to stillwater lakes, it’s a line built for year-round freshwater action, but is not made for truly tropical situations, where you'll find that the line will limpen up under those conditions.

Taper/Weight

Long Head, Substantial Front Taper, Half-Size Heavy - Scientific Anglers designed the Amplitude Textured Infinity around a half-size heavy build paired with an extended head and solid front taper. This combination gives the line both the punch to carry heavy rigs and the grace to land dries with precision. Its balanced taper allows energy to transfer smoothly through the cast with efficient rod loading, making it feel equally at home on fast, moderate, and slower-action rods.

 

More Info

Best For: Trout, Bass, Panfish, Steelhead, Pike

Loops: Front Loop (Leader to Fly Line Connection) and Back Loop (Backing to Fly Line Connection). Sinking/Floating: Floating

Sinking/Floating: Floating

 

Other Resources

2020 Tropical Saltwater Fly Line Shootout & Buyer's Guide

Fly Line Temps: Tropical Vs. Coldwater

Freshwater Fly Line Shootout & Buyer's Guide