A single strand of nylon. Cheap, forgiving, stretchy, and floats. The classic beginner line and still the best choice for treble-hook baits and topwater.
When to use it
Beginners
Topwater and treble-hook baits
Live bait with a bit of give
Reel backing
Strengths
Inexpensive
Stretch forgives mistakes and cushions hooksets
Easy knots
Floats (good for topwater)
Weaknesses
Stretch kills sensitivity at distance/depth
Weakens in UV over time
Larger diameter than braid
Key facts
Best species: Panfish, trout, bass on cranks/topwater, surf bait
Underwater visibility: Moderate — clear/low-vis colors help
Stretch: High
Abrasion resistance: Good
Casting: Good
Knot notes: Excellent — very knot-friendly
Common mistakes
Leaving mono on the reel for years until it's brittle
