Fly Line Types Explained: Floating vs Sinking, Weight-Forward vs Double Taper
The letters on a fly line box tell you almost everything. Here's how to decode them and choose the right line, backing and leader for the way you fish.
For most freshwater fly fishing, start with a weight-forward floating line (labeled WF plus your rod weight plus F, such as WF5F). It casts easily, works with dry flies, nymphs and poppers, and is simple to pick up off the water. Add a sink-tip or intermediate line later if you need to fish streamers deeper or in lakes, and a full sinking line only for consistently deep water.
How to read a fly line label
Fly lines carry a short code that describes three things: taper, weight and density.
| Code part | Examples | Meaning |
|---|---|---|
| Taper | WF, DT, L, ST | Weight-forward, double taper, level, shooting taper (head) |
| Weight | 3 to 12 | Line weight; matches the rod’s rating |
| Density | F, I, F/S, S | Floating, intermediate, floating line with sinking tip, sinking |
So WF5F is a weight-forward 5-weight floating line, and WF7F/S is a weight-forward 7-weight with a sinking tip. Labels on modern lines often add the head length, the actual head weight in grains and, for sinking lines, a sink rate.
Taper: how the weight is distributed
Weight-forward (WF)
Most of the mass sits in the front section, called the head, followed by a thin running line. Once the head is outside the rod tip, the thin running line shoots easily through the guides. That makes WF lines the best general choice for distance, wind and bigger flies. Many specialized versions exist, such as short, heavy heads for bass bugs and streamers.
Double taper (DT)
Thick in the middle with identical tapers at both ends. It’s excellent for delicate presentations and roll casts at short to medium range, and you can reverse the line when the front end wears out. It doesn’t shoot as far as a weight-forward line.
Level (L)
The same diameter all the way. It’s inexpensive but turns over flies poorly, so it’s rarely used today except for very simple setups.
Shooting heads
A short, heavy head attached to a separate thin running line. They’re built for long casts, big flies and two-handed rods, and they let you swap heads of different densities on one running line.
Density: floating, intermediate, sink-tip and sinking
| Line type | What it does | Best for |
|---|---|---|
| Floating | Whole line floats | Dry flies, nymphs under an indicator, poppers, most river fishing |
| Intermediate | Sinks slowly, rides just under the surface | Stillwater, wind and chop, fishing streamers just below the top |
| Sink-tip | Floating body with a sinking front section | Streamers in rivers, swinging flies, getting down while still mending the floating part |
| Full sinking | Entire line sinks at a rated speed | Lakes and reservoirs, deep structure, fish holding near the bottom |
Sinking lines are rated by sink rate in inches per second (ips), from slow intermediates to fast lines rated at several inches per second. A simple way to use the rating is the countdown method: cast, count while the line sinks, and note the count when you get a strike or touch bottom. Repeat that count to keep the fly in the strike zone.
Line color is a clue too. Floating lines are often bright so you can track them; sinking lines are usually darker.
Backing
Backing is thin, strong line wound onto the reel before the fly line. It fills the spool so the fly line coils in larger loops, and it gives you extra length if a fish runs past the end of your fly line.
- Material: braided Dacron (commonly 20- or 30-lb test) is standard and easy to knot. Gel-spun backing is thinner, so more fits on the spool.
- Amount: trout and panfish anglers often use 50 to 100 yards. For steelhead, salmon, big stripers or saltwater, many anglers load 150 yards or more. Reel makers list capacity for each line weight.
- Connection: tie backing to the reel arbor with an arbor knot. Join it to the fly line with a loop-to-loop connection (many lines have a welded loop) or a nail or Albright knot.
The knots used for backing and leaders are covered in our guide to essential fishing knots.
Leaders by line type
The leader connects the thick fly line to the fly and should match both the line and the fly.
- Floating line, dry flies and nymphs: 9-foot tapered leaders are standard; 12 feet or longer for clear, calm water.
- Floating line, poppers and big flies: shorter, stiffer leaders of 6 to 9 feet turn over bulky bugs.
- Sink-tip and sinking lines: keep leaders short, often 3 to 6 feet, so the fly stays down near the line instead of floating up.
Choosing your line, step by step
- Match the weight to your rod. See the fly rod weight chart if you aren’t sure what your rod is.
- Start with a weight-forward floating line. It covers most situations and is easiest to learn on.
- Choose a taper for your flies. Delicate trout tapers for small dries; bass or streamer tapers with short, heavy heads for big, wind-resistant flies.
- Add a second line or spare spool in a sink-tip or intermediate when you want to fish deeper.
- Check temperature ratings. Some lines are made stiffer for tropical heat and others softer for cold water.
Line care
Clean your line with mild soap and water or the maker’s cleaner when it starts to sink at the tip or feel rough. Keep insect repellent and sunscreen off it, since some ingredients can damage coatings. Don’t step on line in gravel or practice on pavement, which scuffs the surface. Good line care also improves casting; our basic fly casting guide covers the strokes.
Bottom line
A weight-forward floating line matched to your rod handles most freshwater fly fishing. Add an intermediate or sink-tip line when fish are deeper, use a full sinking line in lakes when you need to fish near the bottom, and back it all with enough Dacron for the fish you target. Keep leaders long on floating lines and short on sinking lines.
FAQ
What does WF5F mean?
It’s a weight-forward taper, 5-weight, floating line. It matches a 5-weight rod and is the most common trout line.
Is a double taper or weight-forward line better for beginners?
Weight-forward is usually easier for beginners because it loads the rod quickly and shoots line well. Double taper is excellent for short, delicate casts and roll casting.
How much backing do I need?
For trout and panfish, 50 to 100 yards is usually plenty. For fish that make long runs, use more, and check your reel’s listed capacity.
Can I fish sinking flies with a floating line?
Yes. Weighted flies, split shot where legal, and longer leaders let you fish a few feet down with a floating line. For deeper or faster water, a sink-tip works better.
