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Hareline Antron Yarn

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Hareline-Antron-Yarn
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Hareline Antron Yarn is a synthetic fly-tying yarn made from multiple fine filaments combined into a single strand. The tri-lobal cross-section of the fibers gives the yarn a subtle sparkle or sheen by reflecting light at different angles. Antron yarn has a slight crinkle or wavy texture, adding bulk and helping it trap air or light for a translucent effect. It comes spooled in a wide range of colors, including both natural insect tones and bright fluorescents for attractor patterns. Antron is a versatile, easy-to-use material known for its strength and lustrous appearance, making it a staple in many fly tiers’ material kits.

How to Use It  

Fly tiers use Antron yarn in many ways, taking advantage of its shimmery fibers and versatility:  

  • Trailing Shucks & Tails – A small tuft of Antron is often tied in as a *trailing shuck* or tail on emergers and dry flies. The slightly translucent, glossy fibers imitate the shed nymphal shuck of an emerging insect. For example, mayfly emergers like comparaduns or Sparkle Duns use a wisp of Antron at the tail to suggest a nymphal shuck caught in the surface film.
  • Parachute Posts & Wings – Antron yarn makes excellent posts for parachute dry flies and wings on spinners. Tiers bundle and tie it upright as a wing post because it’s bright and easy to see, helping anglers track the fly. For spent mayfly spinners, white or dun-colored Antron can be tied in *spent wing* pairs, mimicking delicate, flat wings. The fine fibers can be trimmed to shape and will capture light, improving the fly’s visibility to both angler and fish.
  • Bodies and Overbodies – Antron yarn can be used as a body material by simply winding it around the hook shank like a floss or rib. Because it lies flat or can be twisted into a cord, it’s great for slim, segmented bodies on flies like caddis pupae, midges, or nymphs. You can also use it as an *overbody* or shellback: tie it in along the back of a scud, shrimp, or nymph and pull it over the top to form a shiny, translucent shell. In larger flies, multiple strands can be used, while for small flies the yarn can be split into finer strands so as not to bulk up the pattern.
  • Legs and Gills – Strands of Antron can be left protruding to suggest insect legs or gill filaments. For instance, some mayfly nymph patterns use a tuft of Antron fibers as *legs* or emerging wing buds. Chironomid pupa patterns sometimes feature a tiny puff of white Antron at the head to imitate the breathing gills of the natural. The material’s slight shine draws attention to these features.
  • Dubbing Blends – Antron is also commonly chopped up and mixed into dubbing to add flash and strength. You can cut the yarn into short fibers and blend it with natural fur or other dubbing; the result is a dubbing that gives a subtle sparkle to nymphs and wet flies. Many popular dubbing blends incorporate Antron for a touch of sheen. This is an easy way to impart the light-catching qualities of Antron to any dubbed body.  

Why We Like it

Hareline Antron Yarn offers several benefits that make it popular among fly tyers:  

  • Durability: Antron is a synthetic nylon material, so it’s very durable and resilient. It does not rot like some natural materials and withstands repeated dunkings and fish teeth well. Using synthetic yarn can make a fly more robust and longer-lasting, meaning your flies hold up better over many casts and fish catches.
  • Sheen & Realism: The tri-lobal filaments give Antron a built-in sparkle or “gleam” that can imitate natural insect qualities. In the water, Antron fibers create a subtle shimmer that resembles things like the sheen of an insect wing or the glint of a gas bubble on an emerging pupa. In fact, famous fly tier Gary LaFontaine found that Antron’s ability to trap air bubbles made his caddis pupa imitations especially lifelike and effective. This subtle flash attracts fish without being as flashy as tinsel or Mylar, so it can entice strikes even from wary fish.  
  • Buoyancy & Adaptability: While Antron yarn itself is not as buoyant as polypropylene floating yarn, its fibers *do* trap some air and it can be treated with floatant. The original Antron fibers are hollow-core nylon, which means dry flies using Antron can float well enough in the surface film, especially if dressed with a floatant. At the same time, Antron also works in wet patterns—its slight sheen actually appears even *brighter* when wet, mimicking translucence. This adaptability allows it to be used in dries, emergers, nymphs, and even streamer patterns with equal effectiveness.  
  • Fish-Attracting Qualities: The combination of a glossy look and the ability to hold tiny bubbles or shine underwater makes Antron a proven fish-attractor. Trout, for example, often key in on the sparkling trailing shuck of an emerger or the glint of a caddis pupa’s casing – both effects achieved with Antron. Additionally, Antron yarn takes dye extremely well, so it comes in fluorescent colors that can serve as hot spots or trigger points on flies. Whether imitating an insect’s natural sparkle or adding an eye-catching highlight, Antron yarn has a way of grabbing fish’s attention.  

Example Flies:

  • Gary LaFontaine’s “Sparkle Pupa” -  is a classic example of Antron yarn in a fly pattern. This caddis pupa imitation uses a loose veil of green Antron yarn fibers around the fly’s body to create a sparkling, translucent sheath that traps air bubbles. Underwater, it realistically imitates the natural gas bubble that a real caddis pupa carries to the surface, making it incredibly effective at fooling trout. Antron yarn’s versatility is evident in the variety of fly patterns that incorporate it. Below are a few examples across different fly categories:  
  • Parachute Adams  – A modern variation of the classic Parachute Adams uses white Antron yarn for the wing post instead of calf hair. The synthetic post is easier to see and floats well enough when treated. The Antron post stands upright from the fly and provides a base to wrap the hackle, and its brightness makes the dry fly more visible on the water. Other parachute-style dry flies similarly use Antron or poly yarn posts for visibility and buoyancy.
  • Sparkle Dun  – The Sparkle Dun is a comparadun-style mayfly emerger that famously uses Antron yarn for its tail. Instead of split hackle fibers, a small bunch of shimmery Antron is tied as a *trailing shuck* off the bend of the hook. This imitates the nymphal shuck of a mayfly dun emerging in the surface film. The Antron tail, combined with a deer hair wing, helps the fly sit low like a struggling emerger. Variations of the Sparkle Dun are tied for many mayfly species, simply changing the yarn color to match the hatch.
  • Serendipity  – The Serendipity is a simple but effective trout nymph that uses Antron yarn as its *body*. In this pattern, a strand of Antron yarn is tied in and then twisted tightly before wrapping it forward to form a segmented, tapered body. The twisted Antron body gives a segmented look with a slight sparkle and translucence. The fly is typically finished with a tuft of deer hair as a head or wing. The Antron-bodied Serendipity sinks well and its glinting body often proves irresistible to trout in rivers.
  • Antron Collared Bugger  – This is a variation of the Woolly Bugger streamer that incorporates Antron for extra flash. An Antron Collar Bugger is tied like a standard bugger, but just behind the cone head it features a collar of shaggy Antron yarn or Antron dubbing fur. The Antron collar adds a halo of sparkle and color around the head of the fly. In the water, that collar catches light and makes the fly more visible, even in turbulent or deep flows. This subtle flash can trigger strikes, especially from trout or bass in murkier water. Variations of streamers and baitfish patterns may also blend Antron fibers into wing or tail materials to create a glint of baitfish scales without the stiffness of heavier flash materials.  
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