A note about links: If we include links to retail sites like Amazon or Bass Pro Shops, it's because they're relevant to the topic and, as anglers ourselves, we believe they're worth checking out. As an Amazon Associate we earn from qualifying purchases.
What it is
Monofilament — “mono” — is a single strand of nylon, and it’s the line most anglers learn on for good reason. It’s cheap, it ties easily, and it does a little of everything. Fishing line is the one piece of tackle that connects you to the fish, and mono is the friendliest place to start that relationship. If you’re filling your first spool, this is almost always the right call.
Two things define how mono behaves. It stretches, and it floats. That stretch acts like a built-in shock absorber — when you set the hook or a fish does a hard head-shake at the boat, the line gives a little instead of ripping the hook free, so you land more of what you hook. The trade-off is feel: that same stretch dulls the subtle taps of a light biter, so you’ll notice less than you would on a no-stretch line. For the full lineup of line types, see the line overview.
When to reach for it
Reach for mono when you want one line that just works. It’s the natural choice on a spinning reel loaded for general freshwater — bass, walleye, catfish, panfish — and for light inshore work like reds and trout. Because it floats, it shines for topwater lures and is perfect under a cork: it’s the go-to for bobber / float fishing and for soaking live bait, where its forgiveness and easy knots matter more than razor sensitivity.
If you want to feel every pebble on bottom, you’d lean toward the no-stretch bite of braid. If you’re fishing clear water and spooky fish, the low visibility of fluorocarbon wins. For everything in between, mono is hard to beat.
How to choose
The number that matters most is pound test — the rated breaking strength. An 8 lb line is built to hold roughly 8 pounds of dead pull before it snaps. Higher pound test means a thicker, stronger line, so diameter climbs right along with the rating: 6 lb mono might run around .009 inch, while 12 lb runs closer to .013 inch. Thicker line is tougher and easier to handle but more visible and bulkier on the spool.
For most beginners, 8-12 lb mono is the all-purpose answer — strong enough for bass and catfish, thin enough to cast well, and forgiving on the knot. Drop to 4-6 lb for panfish and trout, where lighter line casts tiny baits better and stays less visible to small, wary fish.
Two more notes. Color is mostly your preference — clear or clear-blue disappears underwater, while hi-vis green or gold helps you watch your line and detect bites up top; the fish don’t seem to mind either way for most situations. And watch out for “memory”: mono holds the coils of the spool and can spring off in loose loops, especially on cheap or old line. Buy fresh line from a known brand and re-spool once a season, and memory mostly stops being a problem.
Brands worth knowing
Berkley Trilene XL — the classic first spool. “XL” means extra limp, so it casts smooth and resists memory; an easy, low-cost recommendation for any all-purpose setup. Budget tier.
Stren Original — a time-tested, abrasion-resistant mono that’s great around docks, rocks, and brush where line takes a beating. Budget tier.
Sufix Siege — a slightly premium mono known for thin diameter and strong knots, with bright and clear color options. A nice step up when you want better casting without overspending. Mid tier.
P-Line CXX X-tra Strong — a tougher, harder-finish mono for anglers chasing bigger fish or fishing heavy cover. Mid tier.