What Is Copolymer Fishing Line? (VS Fluoro & Mono)

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If you are an avid fisherman, you probably have a pretty good handle on the different types of fishing line and what they are best used for.

However, if you are just getting into fishing, you might be a little confused in terms of what these types of fishing lines are and what they are good for.

Yes, there are monofilament, copolymer, fluorocarbon lines, and braided fishing lines too. Today we are here to discuss copolymer fishing line.

Let’s figure out what copolymer line is made of, what it’s good for, what it’s not so good for, and some other important facts too.

Copolymer vs Fluorocarbon Table

Sinking AbilityCopolymer
Low MemoryCopolymer
Water ResistanceCopolymer

Copolymer vs Monofilament Table

Sinking AbilityCopolymer
Low MemoryCopolymer
Water ResistanceCopolymer

What Is Copolymer Fishing Line?

Ok, so the first thing that we should probably discuss here is what copolymer fishing line actually is.

Now, to be clear, it is fairly similar to monofilament fishing line in many ways. For one, it is made of nylon, which many monofilament fishing lines are also made of.

Yes, both monofilament and copolymer lines can potentially be made out of other materials.

However, due to its fairly high durability and other benefits associated with fishing, nylon is the materials of choice for both of these fishing line types.

How It’s Made

Just like monofilament fishing line, copolymer line is made by taking nylon and stretching it out to form one ling.

However, the difference is that with monofilament fishing line, the nylon used is just of one type, whereas with copolymer lines, there are two different kinds of nylon used.
Here, more is considered better.

Why It’s Desirable

The reason why copolymer lines, or using two different types of nylon is desirable, is because it allows manufacturers to fine tune the features and capabilities of the line.

It allows for greater control over line stretch, durability, abrasion resistance, sensitivity, and all of those other factors that are important when it comes to fishing for various species of fish.

Why It’s Popular

Generally speaking, copolymer fishing line is known to be fairly strong, but not the strongest of all fishing line types.

Moreover, it is known for having a fairly low visibility when submerged, but also not the lowest visibility of all types.

Also, it is known for having decent longevity and durability, yet not the longest. This is also true for sensitivity.

Most people would agree that in most ways, copolymer line is better than monofilament fishing line.

Generally speaking, when compared to all line types, it is actually pretty medium or right in the middle of things when it comes to most features and factors such as stretch, sensitivity, durability, visibility, and more.

Copolymer Fishing Line Pros And Cons

As you have probably gleamed by now, copolymer fishing line is a pretty good choice to go with. It might not be the best ever fishing line in the history of mankind, but it does have certain benefits to speak of.

Let’s talk about the beneficial features of copolymer fishing line and where it really stands out.


One benefit that you get from copolymer fishing line is that it tends to be quite a bit stronger than other types of line, especially standard monofilament and fluorocarbon lines.

Generally speaking, copolymer lines, due to using two nylon polymers, has a fairly high level of impact resistant and abrasion resistance, plus they do not snap very easily.

It’s not quite as strong as braided line, but definitely stronger than monofilament and fluorocarbon lines. What is impressive is that copolymer line has a high level of strength, yet still retains a high level of impact resistance.

While these two things might sound the same, they are not. Impact resistance is related to the stretchiness of the line. Let’s talk about that right now.


Like we just said, copolymer line does actually manage to have quite a bit of stretch or impact resistance, but not too much.

As we mentioned before, copolymer line is pretty smack dab in the middle of things as far as all types of fishing line are concerned.

At any rate, this means that copolymer line stretches and gives a little bit when snagged by a fish or if it gets snagged on something at the bottom of the water.

Instead of just snapping like a really strong and stiff line, it is fairly flexible and will give way a little bit to allow the line to stretch and get the hook imbedded deep in the mouth of a fish.

If the fish is fairly big and wants to fight hard as you try to reel it in, a fairly stretchy copolymer line can be an advantage.

The good mix of strength and stretchiness makes it a pretty good choice for medium and heavy fish that put up big fights.

It’s impressive that two nylon polymers can allows for a line that has both decent levels of stretch and strength.


The next advantage that comes with using a copolymer fishing line is technically related to its strength.

Due to the increased strength of copolymer line, when compared to fluorocarbon and monofilament fishing line, it allows it to be comparatively thin.

If you have a monofilament line, you can have a copolymer line that is about half or three quarters the thickness of it, but still have the same amount of strength, or even more to be exact.

In other words, it is not as thick as some other types of fishing line, and thus allows you to fit more of it on the same spool.

At the end of the day, this allows you to give more slack to fish when needed, and it also allows for further casting distances when needed.

Sinking Ability: Does Copolymer Line Sink or Float?

Yet another benefit that you get with copolymer fishing line is that it does sink pretty quickly. Now, this might not be the best for surface fishing and for bobbers.

However, the fact that it sinks at a decent rate does make it pretty good for deeper fishing applications like ocean and deep sea fishing, bottom fishing, and for suspender rigs too.

If you like the standard characteristics of monofilament line, with a bit of added strength and stretch, but need your line to sink, which monofilament line usually does not do, copolymer line is a really good choice to consider.

Comparatively Low Memory

Now, copolymer fishing line does not have the lowest memory of all line types, but it has lower memory than monofilament line, and usually less than fluorocarbon as well.

Line memory is how much of the shape it retains, the shape that it is usually in. In the case of fishing line, the shape you need to be worried about is the circular or spiral shape of the spool.

The longer fishing line spends on that spool, in that circular shape, the more likely it is to keep that shape. This is of course bad when it comes to casting, tangling, reeling, and general manageability.

Copolymer line is known to have fairly low memory, thus retaining its shape, staying nice and straight, even after long periods on the spool.

It’s not the most manageable or low memory of all line, but it can hold its own.

Good Water Resistance

Another benefit that comes with copolymer line is that it tends to have a high level of water resistance.

It might not seem like it, but all types of fishing line absorb a certain amount of water, which is truer the longer it sits in the water for.

Therefore, if you need a line that you expect to be submerged for longer periods of time, copolymer line will not absorb much of it.

This means that it will stay fairly strong and solid for quite some time, even if it does sit in the water a whole lot.


As should be pretty clear by now, when it comes to fishing lines, the copolymer variety does sit neatly in the middle of things.

In terms of sensitivity, copolymer line is also in the middle.

Although it does have a decent level of stretch, and is quite strong too, copolymer line is somewhat stiff and therefore has a decent amount of sensitivity.

It is not the most sensitive or stiff of all lines, but definitely more so than standard monofilament line and some fluorocarbon lines too.

Having a sensitive line with decent stiffness helps you have more control over the line, it helps you feel the little fish and little bites easily, and it lets you embed the hook quickly too.

It might not be the best for very little fish that require a super delicate hand, but that is about it.

Fairly Low Visibility

Copolymer fishing line does not fare too badly when it comes to the refraction index. In other words, it does a pretty good job at refracting light, which in layman’s terms means that light does not pass through it very quickly.

This translates to a fishing line that has fairly low visibility. It is less visible that monofilament line, and definitely less visible than braided fishing line, but to be clear, not as low visibility as fluorocarbon line.

So, what you have with copolymer line is a line that is not easily seen by fish, making it a good choice for many lighting conditions.

Drawbacks Of Copolymer Fishing Line

Copolymer line really does not have too many drawbacks or disadvantages to speak of. It is better than many types of lines in many ways, but it is also worse than some in a few.

Let’s talk about what could be better about copolymer fishing line.


Now, while copolymer fishing line is fairly strong, stretchy, resistant to abrasion, and has a slow water absorption rate, it is not the longest lasting of all fishing lines out there.

After about a year on the spool it may suffer from some memory issues, plus if you have been fighting big fish with it, it may have taken some wear and tear.

Most copolymer lines will not last more than a year, which is already pushing it.


Yes, it is true that copolymer line is less visible than most monofilament lines, and definitely less visible than braided lines, it is more visible when submerged than fluorocarbon line.

If visibility is your number one concern, going with fluorocarbon line, as opposed to copolymer, might be the better option.

Comparatively High Cost

This might be a drawback for some. Copolymer line is quite a bit more expensive than your standard monofilament line, but of course, it is also better.

With that being said, it is cheaper than most braided lines.

Best Uses For Copolymer Fishing Line

Copolymer fishing line is a great choice for a wide variety of applications. Generally speaking, it fares well across the board and does pretty good for more or less all fishing types and applications.

It’s a middle of the line fishing line that does well in most fields and does not do too bad in any.

With that being said, there are some fishing applications which it does really excel at.

Suspension Rigging

Copolymer fishing line does have a fairly neutral sinking profile, which means that it sinks at a fairly moderate rate.

This makes it ideal for suspension rigs and some swim baiting too. It’s a good choice if you need depth or are aiming for a specific depth.

Deep Water Crankbaiting

With lots of stretch and strength, good durability, fairly low visibility, lots of water resistance, and a decent amount of sensitivity, copolymer line excels at crankbaiting.

You can crank and reel on a crankbait with as much pressure and force as you want with a copolymer line and all should go just fine.


Copolymer line, due to being strong, stretchy, and having a good sinking profile, makes it a prime choice for running along the bottom and jigging in tough conditions with lots of weeds, rocks, and other obstacles.

It has plenty of strength to crank in those big boys from even the deepest and toughest of waters.


At the end of the day, copolymer fishing line is a fantastic choice of line to go with for a variety of reasons. It might not the be the very best lines in all ways, but it surely does excel in many avenues.

With a good amount of stretch, lots of strength, some sensitivity, low memory, fairly low visibility, and a neutral sinking profile, it’s a good option for many kinds of fishing and prey.