Heavy Sink

$99.95 USD Save

Cortland’s Tropic Plus Heavy Sink is built with a stiff tropic jacket and a highly abrasion resistant 50lb core. The 30ft fast sinking head paired with a super slick intermediate running line allows you to get your fly down deep. An over-sized running line prevents tangles and increases grip for hard hook sets.

- 30ft Sinking Head
- Intermediate Running Line
- Fifty Pound Plus Core

WATER: Saltwater
LINE: Sinking / Intermediate
TAPER: Weight Forward
LENGTH: 100ft
CORE: Braided Nylon Multifilament
SPECIES: Tuna / Giant Trevally / Jack Trevally / Jungle Species / Shark

Size WF 9 / 10 - 400 GRAINS

United States deliveries usually take 3-8 business days.

International deliveries can take up to 7 - 18 days.

If you have any question about shipping Contact Us our customer service department is here to help.

 P65 - WARNING: Cancer and Reproductive Harm

Saltwater Sinking / Intermediate Weight Forward Braided Nylon Multifilament

WF 9/10 400 gr. 30 ft. 100 ft.
WF 10/11 450 gr. 30 ft. 100 ft.
WF 11/12 500 gr. 30 ft. 100 ft.

Heavy Sink Breakdown

The right choice for targeting large game fish down deep.

Our Tropic Plus Heavy Sink features a 30 ft. type 6 sinking head with a short 2 ft. front taper for turning over all large ocean patterns. The short 3 ft. back taper helps load this line quickly and makes it extremely shootable. Intermediate running line removes any hinges in the line and gives you a smooth transition into the depths.

Built on a 50lb braid core for ultimate stopping power and durability, the heavy sink features our signature tropic plus coating for withstanding the hottest temperatures while still remaining slick, supple and fast shooting. This line is finished in a black and smoke color.

SPECIES: Tuna / Giant Trevally / Jack Trevally / Jungle Species / Shark


Welded loops make rigging fast, easy and reliable. Cortland loops are strong, secure and durable.


ST coating delivers a reduced-friction performance with a glass-smooth finish and remains a key element in line slickness over its life span.


The perfect blend of advanced polymers to achieve a hard, durable surface that remains slick in extreme heat.


Built for the most demanding species. Core strength of more than 50lbs allows anglers to put maximum drag and pressure on a fish without compromising the taper design or line density.


Ideal use in 50 - 70 degree (F) temperatures


Ideal use in 70 + degree (F) temperatures

Our Tropic Plus Heavy Sink is built for tropic environments and will perform best in temperatures above 70 degrees (F). Our Tropic PVC coating is designed to remain hard, slick and supple in the hottest conditions.

The taper design for our Heavy Sink line was built to be aggressive up front to quickly transfer energy into your cast and easily turn over any large fly pattern. The short rear taper helps excel in quick loading and fast shooting.

This line is built on a 50 LB core to hold up to the hardest pulling fish in the saltwater. Built in 400-500 grains to load heavy fast action fly rods.

The black and smoke finish distinguishes taper change and ideal loading point while remaining stealthy in deep water.

Cleaning your fly line is very important especially when fishing saltwater. Simply pull line off your reel into a clean bucket or tub of freshwater. Put roughly 1oz or more of Cortland’s Line Cleaner solution onto a clean rag or towel. Firmly squeeze the towel with Pro Line Cleaner around the line and slowly pull line through the towel. You should be able to see dirt or discolored streaks on the towel when finished.

Learn more about Cortland's Fly Line Cleaner Lubricant & Pads.

Hover: Neutral
Slow Intermediate: 1 IPS (Inches Per Second) 
Medium Intermediate: 1.5 - 2 IPS (Inches Per Second)
Fast Intermediate: 2 - 3 IPS (Inches Per Second)
Type 3 Sink Rate: 3 - 4 IPS (Inches Per Second)
Type 4 Sink Rate: 4 - 5 IPS (Inches Per Second)
Type 5 Sink Rate: 5 - 6 IPS (Inches Per Second)
Type 6 Sink Rate: 6 - 7 IPS (Inches Per Second)
Type 7 Sink Rate: 7 - 8 IPS (Inches Per Second)
Type 9 Sink Rate: 9+ IPS (Inches Per Second)

average rating 5.0 out of 5
Based on 3 reviews
  • 5 Stars
    3 Reviews
  • 4 Stars
    0 Reviews
  • 3 Stars
    0 Reviews
  • 2 Stars
    0 Reviews
  • 1 Star
    0 Reviews
100% of reviewers would recommend this product to a friend
Customer photos and videos
3 Reviews
Reviewed by Phillip L.
Verified Buyer
I recommend this product
Rated 5 out of 5
Review posted

Gets to the Strike Zone fast

Cortland Heavy Sink has been a perfect match here in the Chesapeake Bay when we are throwing big heavy flys to migrating Stripers or Bull Redfish. It gets down to the strike zone fast and you can pick up to reposition quickly.

Was this helpful?
Reviewed by Armando G.
Verified Buyer
I recommend this product
Rated 5 out of 5
Review posted


Like it very much, no tangles in the running line, gets the fly deep fast, allows me to fish heavy currents efectvely.

Was this helpful?
Reviewed by Bo B.
Verified Buyer
I recommend this product
Rated 5 out of 5
Review posted


I used this line for 15 days in Colombia in 2022

Found it to be vey productive. Sinks quickly and retrieves like a dream - easily casts large flies in windy conditions

Will definitely use again in South American in 2023

Was this helpful?