So what is Co-polymer?

 trying to understand this stuff really is it more Mono or fluoro? what characteristics does it have. seems to me this stuff would be awesome for  cranking and well and moving baits.

In my experience it is a poor mans fluorocarbon.  

As the word implies, "copolymer" refers to a combination of polymers (plastics).

With few exceptions, copolymer line is a blend of "nylon" and "fluorocarbon".

By blending both line materials, you capture some of the best features of each material

while moderating some of their worst material features.

Never forget, no copolymer line can possibly offer nylon attributes superior to pure nylon

and no copolymer line can possibly offer fluorocarbon attributes superior to pure fluorocarbon.

It is always a compromise, and the copolymer line you choose should be determined

by the line attributes you want to enhance.

Most copolymer lines are "monofilament" just like pure nylon mono and just like pure fluorocarbon (Yes, fluoro is mono).

However, some copolymer lines are cofilament, which have a core within a shell.

Roger

In my experience it is a poor mans fluorocarbon.

but with less memory and better knot strength.

In my experience it is a poor mans fluorocarbon.

but with less memory and better knot strength.

That is true, and those attributes are inherited from the nylon component (pure fluoro is like wire).

On the downside, copolymer has greater line stretch than fluorocarbon and is not as abrasion-resistant.

Roger

sweet deal seems to me that this stuff would make great shallow/medium cranking, spinnerbait  line. If it doesn't take the sink characteristics of fluoro than suppose it would be awesome for top water.

THANKS FOR ALL THE INFO

It takes the floating characteristic of mono, although I have noticed some have a very slow sink.  

Also, if I am remembering correctly, a dry flourocarbon line has more stretch than mono or copoly.  When the water variable is added, however, flourocarbon tends to stretch less due to less water absorbed when compared to mono or copoly which absorb more water.  

I still use a co-poly.  Realine though it's not made anymore.  It's really been an outstanding line for me and I'm sure co-poly's made by the name brands will work the same.

The advantages.

Less stretch than standard mono's.

Doesn't sink like a Flouro, something to think about when working some crankbait presentations and suspending jerkbaits.

Better abrasion resistance than regular mono.

Lays better on the spool vs. Flouro., less kinkiness.

Cheaper than Flouro, a little more expensive than regular mono.