Scientific Angler Amplitude Smooth Trout GP Floating Fly Line
The Scientific Anglers Amplitude Smooth Trout GP Fly Lines are a quarter line weight size heavy fly line designed for experienced casters looking for a general purpose freshwater line. The Amplitude Smooth series of lines are, simply put, the highest-performance smooth fly lines in the world. With up to five times less drag and eight times the durability of traditional lines, this will change the way you look at fly line performance.
- Features the revolutionary AST Plus slickness additive for superior shooting ability and increased durability
- Mid-length head for exceptional mending and accuracy at distance
- Designed for casters
- Quarter line weight size heavy
- Braided multifilament core
- Printed line ID
- Welded joint
| Specification | Value |
|---|---|
| Line Weight | Quarter (1/4) size heavy |
| Core Type | Braided multifilament |
| Head Type | Mid-length |
| Drag Reduction | Up to five times less drag |
| Durability | Eight times more durable than traditional lines |
| Finish | Smooth with AST Plus additive |
FAQ
What makes the AST Plus additive special?
The AST Plus slickness additive improves shooting performance and increases line durability by reducing friction during casting and improving surface smoothness.
Is this line suitable for long-distance casting?
Yes, the mid-length head provides excellent mending and accuracy at distance, making it ideal for experienced anglers who cast frequently over longer ranges.
Does this line come with a warranty?
Please contact customer service

Chloe Thomson –
This line performs exceptionally well in both still and moving water. The cast is smooth and the drag is minimal, which makes it easier to maintain control during long casts. I’ve used it for several weeks in trout streams and it hasn’t shown any wear despite frequent use.
Penelope May –
The mid-length head allows for precise mending, which is a big advantage when fishing in tight spots. The AST Plus additive gives a noticeably smoother cast compared to my previous line. Durability has been impressive after multiple trips to the river.
Edward Lambert –
Great for experienced anglers who value performance. The line feels responsive and the casting action is clean. A bit heavier than I expected for a quarter weight, but that may be due to the braided core.