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What it is
Fishing line is the one piece of tackle that connects you to the fish — every cast, every bite, every fight runs through it. A great rod and reel can’t save you from bad line, and good line quietly makes everything else work better. That is why it pays to understand the three main types before you fill a spool, because each one behaves differently in the water and shines in different situations.
The three mainlines you will hear about are monofilament, fluorocarbon, and braid. They are made from different materials and they stretch, sink, and show up differently underwater. None of them is “best” across the board — the right choice depends on where you fish, what you fish for, and how the line needs to behave. Once you understand those differences, picking line stops being guesswork.
Types to know
Monofilament (mono). A single strand of nylon, and the friendly place for almost every beginner to start. Mono is cheap, easy to tie, and it stretches — and that stretch is a feature, not a flaw. The give absorbs the shock of a hookset and a head-shaking fish, so you tear fewer hooks loose. Mono also floats, which makes it the natural choice for topwater lures and bobber rigs. Its downsides are that stretch dulls your feel for subtle bites, and it develops “memory” — it holds the coil shape of the spool and can come off in springy loops. For a first setup, mono is hard to beat.
Fluorocarbon (fluoro). Also a single strand, but made from a denser material that bends light almost exactly like water does, so it is nearly invisible to fish. Fluoro sinks, stretches far less than mono, and resists abrasion well against rocks, oyster bars, and dock pilings. That low stretch and low visibility make it excellent in clear water and around structure. Many anglers don’t spool a whole reel with it — they use it as a leader, a short section tied to the end of their mainline. It costs more than mono and can be a touch stiffer to tie, so good knots matter.
Braid. Several thin fibers woven together into one super-strong, thin-diameter line. Braid has almost no stretch, so it transmits the lightest tap straight to your hand — it is the most sensitive of the three. It is incredibly strong for its thickness, which means more line on the spool and longer casts, and it cuts through heavy cover. The trade-offs: braid is visible in the water, so fish can see it, and it has no shock absorption, so you must set the drag thoughtfully. The fix for the visibility is simple — add a leader, which we’ll get to below.
Leaders and wire. A leader is a short length of line — usually fluorocarbon or mono — tied between your mainline and your hook or lure. It adds invisibility and abrasion resistance right where the fish bites. For toothy fish like bluefish, pike, and mackerel, even fluoro gets cut, so you step up to a short wire leader that teeth can’t slice.
Explore every line type
We’ve written a dedicated guide for each line. The first three are the mainlines you choose between to fill a spool; the rest are specialists that ride at the end of your line or serve a particular kind of fishing.
The three mainlines
- Monofilament — cheap, forgiving, and the best first line
- Fluorocarbon — nearly invisible and abrasion-resistant
- Braid — thin, strong, and zero-stretch sensitive
Terminal & leader lines
- Leaders & leader line — a tougher, stealthier section between braid and lure
- Tippet — the thin fly-fishing terminal section (X-sizing)
- Wire leader — bite-proof line for toothy fish
Specialty lines
- Fly line — the weighted line that carries a fly cast
- Leadcore & trolling line — sinks lures deep on the troll
- Ice fishing line — limp, low-memory line for the cold
How to choose
Start with pound test — the line’s rated breaking strength, like “10 lb test.” Higher test means a stronger but thicker line. The goal is to match the test to your reel, your target fish, and your cover. Light reels and finesse panfish want 4-8 lb; all-around bass and inshore work lives around 10-20 lb; heavy cover and big fish climb from there. Your reel will list a recommended line capacity — stay near it so the spool fills and casts smoothly.
Think about how you want the line to behave. Want forgiveness and float for topwater or a beginner setup? Mono. Want invisibility and toughness in clear water or around rock? Fluoro. Want maximum sensitivity, distance, and strength for bottom feel or heavy cover? Braid. Also watch for line memory — mono coils most, fluoro less, and braid not at all. If your line keeps springing into loops, it has memory, and fresh line or a switch to braid solves it.
For most anglers, the single most versatile rig is the braid-to-fluoro leader setup: braid mainline for sensitivity, distance, and strength, joined to a fluorocarbon leader for invisibility and abrasion resistance near the fish. You get the best of both. A common inshore example is 10-20 lb braid tied to a 20-30 lb fluoro leader. The catch is that braid and fluoro are slippery, so the connection knot has to be right — a sloppy knot is where this setup fails. Learn a couple of solid connections from our fishing knots guide before you trust it on a good fish.
Brands worth knowing
Monofilament: Berkley Trilene XL and Stren Original are the long-standing, do-everything mono choices — cheap, reliable, and easy to find anywhere.
Fluorocarbon: Seaguar fluorocarbon is the reference standard, especially as leader material, and Berkley Vanish is a more affordable everyday option.
Braid: PowerPro braid and Sufix 832 braid are two of the most trusted braids on the water, with smooth, round profiles that cast well and hold their strength season after season.