Scientific Anglers Amplitude Smooth Infinity Fly Line
If you’re not into noisy lines, then the Amplitude Smooth is the line for you. So smooth!
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.
The conventional wisdom in fly fishing is that there’s no such thing as a “do it all” freshwater line. We have something to say about that. The Amplitude Smooth Infinity has the power to bomb out streamers, yet retains delicacy for dry flies. It mends like an absolute dream, and delivers flies at all distances. Built a half-size heavy, with a long head and substantial front taper, it’s perfect for e
| Specification | Value |
|---|---|
| Line Type | Smooth Fly Line |
| Weight | Half-Size Heavy |
| Drag Reduction | Up to five times less drag |
| Durability | Eight times more durable than traditional lines |
| Performance | Effective for both streamers and dry flies |
FAQ
What makes the Amplitude Smooth Infinity different from other fly lines?
It offers up to five times less drag and eight times the durability of traditional lines, with smooth performance that reduces noise and enhances casting accuracy.
Is this line suitable for both dry flies and streamers?
Yes, the Amplitude Smooth Infinity is designed to handle both dry flies and streamers effectively, maintaining delicacy for dry flies while delivering power for streamers.
What is the recommended weight for this fly line?
It is built as a half-size heavy line, ideal for a range of freshwater fishing conditions.


Dominic Wallace –
This line casts smoothly without any noise, which makes a big difference in quiet streams. I’ve used it for both dry flies and streamers and it performs well in all conditions. The drag is minimal and the line holds up well after repeated use.
Andrew MacLeod –
I was skeptical about a smooth line being strong enough, but the Amplitude Smooth Infinity delivers. It mends easily and casts farther than my previous line. Great balance between delicacy and power.
Madeleine Peters –
The line feels very smooth and quiet on the water. It works well for dry fly fishing, and I’ve had success with streamers too. A bit heavier than expected, but still very manageable.
Wendy Glover –
After switching to this line, I noticed a significant improvement in casting distance and accuracy. The durability is impressive, and it doesn’t fray even after several hours of use.