

Collections: Fly Lines, Freshwater Fly Lines, productcatalog
Designed for anglers who crave the elegance of traditional tapers with the performance edge of today’s tech, the Scientific Anglers Amplitude Smooth Double Taper line blends innovation with classic control. Featuring AST PLUS slickness additive, this line delivers superior shootability and durability, while its double taper profile excels in delicate dry fly presentations—especially when paired with glass, bamboo, or slower-action rods. Whether you're stalking trout on calm water or simply prefer the control and roll-casting versatility of a DT, this line performs with silky precision.
AST PLUS Slickness Technology
Proprietary additive ensures ultra-slick performance and dramatically enhanced durability
Double Taper for Finesse
Ideal for smooth roll casts, delicate presentations, and mending at distance—especially on classic rods
Versatile Performance
Best suited for dry flies and smaller nymphs in moderate to cold conditions
Braided Multifilament Core
Offers a supple feel and minimal memory across a range of water temps
Line Identification
Laser-printed SA AMP S DBLE TPR DT X F for easy recognition
| Line Weight | Belly Length | Total Length | Grain Weight* |
|---|---|---|---|
| DT-3-F | 75.0’ (22.9 m) | 85’ (25.9 m) | 100 gr (6.5 g) |
| DT-4-F | 73.5’ (22.4 m) | 85’ (25.9 m) | 120 gr (7.8 g) |
| DT-5-F | 72.0’ (21.9 m) | 85’ (25.9 m) | 140 gr (9.1 g) |
Style No.: Varies by line weight (e.g., 144261, 144278, 144285)
Master the art of presentation and experience timeless performance with the Amplitude Smooth Double Taper—the modern standard for traditional fly line design.