The SA Amplitude Smooth Trout Fly Line with AST Plus is a premium fly line from Scientific Anglers (SA), designed for trout fishing with advanced features for smooth casting, durability, and performance. Here’s a detailed breakdown:
Key Features:
1. AST Plus Coating Technology
– Provides a slick, durable finish for reduced friction and longer casting distance.
– Resists dirt, UV damage, and retains flexibility in cold conditions.
2. Smooth Texture
– Unlike textured lines, this has a smooth surface for quieter presentations and reduced line slap.

– Ideal for delicate dry fly fishing.
3. Precision Taper Design
– Optimized for accuracy and turnover with a balanced weight-forward taper.
– Works well with modern fast-action rods.
4. Durable Core
– Features a low-stretch core for better sensitivity and hook-setting power.
5. Color Options
– Typically comes in peach/orange for high visibility on the water.
Best Uses:
– Dry flies, nymphs, and small streamers
– Technical trout fishing (spring creeks, tailwaters, stillwaters)
– Anglers who prefer smooth lines over textured ones
Available Weights & Variants:
– Usually in WF (Weight Forward) configurations (e.g., WF3F, WF4F, WF5F, etc.).
– Also available in Double Taper (DT) for delicate presentations.
Pros:
✅ Superb slickness for effortless casting.
✅ Durable and long-lasting.
✅ Excellent for precision dry fly fishing.
Cons:
❌ Higher price point than standard lines.
❌ Not as aggressive as textured lines for extreme distance.
Comparison to Other SA Lines:
– Amplitude Textured Trout – Better for distance but noisier.
– MPX (Mastery Series) – More aggressive taper for versatility.
– Infinity Smooth – Similar smoothness but with a different taper for all-around use.
Final Verdict:
If you prioritize smooth, quiet presentations and want a high-end trout line with durability and performance, the Amplitude Smooth Trout with AST Plus is an excellent choice.
Would you like recommendations for specific setups (rod pairing, leader setups, etc.)?