Name: Amplitude Smooth Infinity Plus
SKU: Scientific Anglers Amplitude Smooth Infinity Plus
Availability: InStock
Rating: 5.00 (1 reviews)

Amplitude Smooth Infinity Plus

$99.95

Rated 5.00 out of 5 based on 1 customer rating

(1 customer review)

ONE SIZE HEAVY 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
A scaled up version of our general purpose Infinity taper, the Infinity Plus is built a full size heavy for the fastest 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)

Technology

Water Type

Water Temp

Fishing Type

Species

Quick Info SKU: Scientific Anglers Amplitude Smooth Infinity Plus Categories: Amplitude Smooth Fly Lines

Description

TAPER DIAGRAM

SPECIFICATIONS

ITEM NUMBER	LINE WEIGHT	HEAD LENGTH	TOTAL LENGTH	HEAD WEIGHT	GRAIN WEIGHT*
142861	WF-3-F	47.0’/14,3m	90.0’/27,4m	170gr/11,0g	120gr/7,7g
142878	WF-4-F	48.0’/14,6m	90.0’/27,4m	205gr/13,2g	140gr/9,7g
142885	WF-5-F	49.0’/14,9m	90.0’/27,4m	245gr/15,8g	160gr/10,3g
142892	WF-6-F	50.0’/15,2m	90.0’/27,4m	285gr/18,4g	185gr/11,9g
142908	WF-7-F	51.0’/15,5m	90.0’/27,4m	330gr/21,3g	210gr/13,6g
142915	WF-8-F	52.0’/15,8m	90.0’/27,4m	385gr/24,9g	240gr/15,5g

* Grain weight for the first 30′

Additional information

Weight	1 lbs
Technology	AST Plus, Improved Dry Tip, SA Line ID, Welded Loops
Water Type	Freshwater
Water Temp	Cold, Medium
Fishing Type	Streamers, Nymphs, Dries, Indicators, Poppers/Big Dries
Species	Trout, Bass, Grayling, Steelhead, Panfish, Carp

1 review for Amplitude Smooth Infinity Plus

Rated 5 out of 5

k.b. – April 25, 2026

I really dig fishing this taper in the “true to weight” fashion, was actually not a huge fan of the Infinity taper until I tried it that way on my favorite 4, 5 & 6wts. I primarily use it for dries and dry/dropper fishing with a tiny bit of nymphing tossed in. Just a great taper that is very stable in the air, handles a wide array of flies and is pretty much the swiss army knife of Trout fishing. It seems to excel at everything but hucking the largest of streamers or heaviest of nymph rigs on waters big and small…