SA Amplitude Smooth Infinity Plus Taper
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
- A scaled up version of our general purpose Infinity taper, the Infinity Plus is built for full size heavy rods and larger trout rigs
- Underlining Infinity Plus by 1 size creates an AFFTA true standard weight for slower rods and advanced casters
- Braided multifilament core
- SA AMP S INFNTY PLUS WF X F (X = line weight)
| Specification | Value |
|---|---|
| Line Type | Smooth Fly Line |
| Taper | Infinity Plus |
| Core Material | Braided Multifilament |
| Drag Reduction | Up to five times less drag |
| Durability | Eight times more durable than traditional lines |
| Key Feature | AST Plus slickness additive |
FAQ
What makes the AST Plus additive different from other slickness additives?
The AST Plus additive provides superior shooting ability and increased durability compared to standard additives, enhancing line performance under high-speed casting conditions.
Is the Infinity Plus suitable for use with heavy-duty rods?
Yes, the Infinity Plus is specifically designed for full-size heavy rods and larger trout rigs, offering optimal performance with high-power casting applications.
Can I use this line with slower rods?
Underlining the Infinity Plus by one size creates a standard weight that is suitable for slower rods and advanced casters, making it versatile across different rod types.


Matt Roberts –
This line casts smoothly even at high speeds. The drag reduction is noticeable, and it holds up well after repeated use in rough conditions. I’ve switched from a traditional line and see a clear improvement in casting distance and consistency.
Benjamin Baker –
The AST Plus additive makes a big difference in how the line shoots. It feels slick and responsive, especially when casting with a heavy rod. Durability has been excellent after several seasons of fishing.
Oliver Arnold –
Great for larger trout setups. The taper is well-suited for heavy rods, and the braided core adds strength without adding weight. A bit more expensive, but worth it for performance.
Christopher Poole –
I’ve used this line in both fast and slow casting scenarios. The versatility across different rod types is impressive. The durability is outstanding, and it doesn’t fray easily.