Copolymer

Mono's upgraded cousin — multiple nylon materials blended for less stretch and smaller diameter than standard mono, while keeping easy handling and knots.

When to use it

All-around main line
Crankbaits and moving baits
Anglers who want mono handling with more sensitivity

Strengths

Less stretch than mono
Thinner and often stronger than mono
Still knots easily and casts smoothly

Weaknesses

More expensive than basic mono
Still more visible/stretchy than fluoro or braid

Key facts

Best species: Bass, walleye, all-around freshwater and light inshore

Underwater visibility: Moderate

Stretch: Moderate (less than mono)

Abrasion resistance: Good

Casting: Very good

Knot notes: Excellent

Common mistakes

Assuming it's the same as cheap mono
Ignoring it as a great value main line