From early-summer evenings spent casting to risers in the tailout to fall mornings with slow-moving trout sipping midges, SA's Amplitude Smooth Trout Expert Fly Line is built for those who live for precision and finesse. Whether you’re fishing bamboo, glass, or slower graphite, this line’s true-to-weight design gives you unmatched control and feedback when casting small dries or lightweight nymphs, while its smooth and specialized construction reduces drag by up to five times--think of it as your ace in the hole when fishing clear, slow-moving conditions. And thanks to Scientific Anglers’ advanced slickness technologies, it does all that with effortless shootability and long-term durability that far outlasts the average line. Built in line weights 2 through 7, the Amplitude Smooth Trout Expert Line has an option for every trout fishing scenario you'll come across. 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. . Uses Dry Flies, Nymphs, and Wet Flies -Scientific Anglers' Amplitude Smooth Trout Expert is made for anglers who prefer precision over power. Perfect for dry fly purists, it excels at medium to long distances and shines when delicacy matters most. An excellent dry fly line, but equally capable of handling small nymphs or emergers when a light touch and true turnover make all the difference, this is the perfect line for technical fishing conditions. Temp Cold to Moderate - From spring creeks to alpine rivers, this line stays supple in cooler temps and won’t stiffen up when the morning frost sets in. It’s designed for the broad range of trout conditions most anglers face throughout the year. Taper/Weight Elongated Front Taper, True-to-Weight Configuration - For trout that demand a delicate touch, the elongated front taper allows pinpoint presentations with small dry flies, nymphs, and emergers. It also lays your fly down softly, keeping from spooking wary fish in clear water—ideal for technical streams and smooth tailwaters. A true-to-grain-weight build finishes things off by giving you the most accurate rod loading and feedback possible. More Info Best For: Trout Loops: Front Loop (Leader to Fly Line Connection) and Back Loop (Backing to Fly Line Connection) Sinking/Floating: Floating