Skydiving Canopy Line Types Explained

Choosing the right line type for a parachute canopy is an important decision that affects performance, longevity, and even comfort under canopy. Different line materials have their own strengths and trade-offs, which is why manufacturers often recommend specific line types for each canopy model. Below is an overview of the most common parachute line types used in sport skydiving today.

Dacron

Dacron is a polyester line known for its elasticity and durability. Because it stretches slightly under load, Dacron softens the impact of harder openings, reducing stress on both the jumper and the equipment. This makes it a common choice for student operations, where body position during deployment may be inconsistent, and for jumpers who want extra protection against abrupt openings. The trade-off is that Dacron has more bulk and drag than other modern line types, so it doesn’t pack as small or fly quite as fast. Still, its forgiving nature makes it a solid option for training rigs, camera flyers with heavy helmets, and anyone prioritizing comfort over maximum performance.

Spectra / Dyneema (Microline)

Spectra or Dyneema are brand names for Microline, is a high-strength polyethylene fiber valued for its resistance to abrasion. It handles rough conditions, like sand and desert environments, better than other high-performance lines. However, Spectra is not dimensionally stable. Over time, it tends to shrink due to friction from the slider and repeated use. This gradual change in line length alters the canopy’s trim, affecting flight characteristics and requiring periodic relines to restore performance. While it offers low bulk and long wear life in harsh environments, jumpers should be aware that Spectra-lined canopies may go out of trim after several hundred jumps.

Vectran

Vectran is a liquid crystal polymer fiber that is highly dimensionally stable. This means it maintains its original trim exceptionally well, even after hundreds of jumps. For this reason, Vectran is often chosen for smaller, higher-performance canopies where precise flight characteristics are critical. On the downside, Vectran is more vulnerable to abrasion than Spectra, especially in sandy or dusty conditions. While it delivers consistency in canopy handling and openings, jumpers using Vectran lines need to inspect them regularly for wear. Its balance of stability and performance makes it a popular choice among experienced skydivers flying sport canopies.

HMA

HMA (High Modulus Aramid) shares many of Vectran’s positive traits but with even lower bulk and drag. This makes HMA an attractive option for competitive and performance-oriented jumpers who want the smallest possible pack volume and the cleanest flight profile. Like Vectran, HMA holds trim very well, maintaining consistent flight characteristics over its lifespan. Its drawback is relatively poor abrasion resistance, meaning it can wear out faster in rough environments. HMA is most commonly found on high-performance sport canopies where efficiency and responsiveness outweigh the need for maximum durability.

Final Thoughts

While Dacron, Spectra, Vectran, and HMA are the most common choices for sport parachutes these days, some specialty canopies use other line configurations. Canopies designed for canopy formation (CRW) often use thicker lines to handle wraps and friction, while tandem systems rely on much stronger lines to withstand the heavier loads. The best line type ultimately depends on the canopy design, the jumper’s needs, and the environment in which the gear is used. 

Always follow the manufacturer’s recommendations for the safest and most consistent performance.