The three families and what separates them

Almost every zipper on a garment belongs to one of three families. Nylon coil zippers are made from a continuous synthetic filament wound into a spiral. Resin, also called moulded-tooth or plastic, zippers are produced by injecting acetal resin around a woven tape at intervals. Metal zippers use brass, aluminium, or zinc alloy teeth stamped or die-cast onto the tape.

The differences are not cosmetic. They determine how the closure behaves under load, how it feels against skin, how it survives laundry, and how much it adds to the garment's cost. Choosing between them is a design decision with measurable consequences.

Weight and hand feel

Nylon coil is the lightest option per unit length and the most flexible. A #5 coil chain bends easily around a curved neckline and adds almost nothing to the weight of a lightweight shell. That flexibility is why coil dominates down jackets, packable rainwear, and performance knitwear.

Resin teeth are heavier and more rigid. They create a defined, architectural line along the front of a jacket, which many outerwear designers want. The stiffness also means resin zippers hold their shape when the garment is open, rather than curling back on itself.

Metal is the heaviest and the least forgiving. A #5 brass zipper can weigh two to three times as much as the equivalent coil. On denim, canvas, and leather it reads as a deliberate material choice. On a 40-gram down jacket it reads as a mistake.

Strength and failure behaviour

  • Nylon coil: excellent tensile strength along the tape, moderate lateral strength. Under excessive side load the chain can spread and the slider can ride over the teeth, a failure that is often repairable by re-threading rather than replacement.
  • Resin: the strongest lateral resistance of the three in normal garment gauges. Individual teeth can chip or break under impact, and a broken tooth usually requires replacing the slider or the whole zipper.
  • Metal: highest pull strength and the most durable under repeated heavy loading. Brass discolours and can corrode in salt water; aluminium is lighter but softer and dents more easily.

For most apparel, the weak point is not the chain but the tape, the stitch line, or the end stop. A metal zipper sewn with a weak seam will still fail at the seam, so upgrading the chain without upgrading the construction buys nothing.

Colour and finishing

Nylon coil takes dye through the polymer and can be matched closely to fabric, including bright fashion shades. The tape and the teeth are usually dyed together, which keeps the closure visually quiet.

Resin teeth are pigmented in the moulding compound, so the colour range is broad but the match to a specific Pantone reference depends on the moulder's masterbatch. Tape and teeth are produced separately and can drift apart in shade, especially across lots.

Metal offers the widest range of surface finishes: polished brass, antique brass, nickel-free plating, gunmetal, and painted coatings. The trade-off is that plated finishes wear at the slider contact points, and nickel release is regulated in Europe. Specify nickel-free plating for any product sold into the EU or UK market, and confirm with a test report rather than a supplier statement.

Corrosion and laundry

Nylon and resin are effectively immune to rust, which is why they dominate swimwear, activewear, and childrenswear. Metal zippers require a protective plating, and even good plating degrades with chlorine, salt, and repeated industrial washing.

If a metal zipper is essential for styling on a garment that will be washed frequently, choose a plated brass chain with a confirmed salt-spray result, and warn the consumer in the care label. For workwear that undergoes industrial laundering, resin or coil is the safer specification regardless of aesthetics.

Cost structure

At equivalent gauge, nylon coil is generally the lowest cost, resin sits in the middle, and metal is the highest, though the gap narrows at small gauges and widens at large ones. Tooling changes the picture: a custom slider or a unique pull design can add a one-time charge that dominates the unit price on a small order. Standard sliders and pulls on a stock colour are always the cheapest route.

Total cost also includes assembly time. Coil is quick to sew because it is flexible and forgiving. Metal requires more careful alignment and often a heavier needle and thread, which slows the line. On a high-volume basic, that labour difference can exceed the component price difference.

Matching material to garment

  • Down jackets and packable shells: reverse coil nylon, #3 to #5.
  • Ski and snowboard outerwear: resin or heavy coil, #8 to #10, with a large pull for gloves.
  • Denim and workwear: brass or nickel-free metal, #4 to #5.
  • Leather goods and bags: large metal or resin, #8 to #15.
  • Swimwear and activewear: nylon coil with corrosion-resistant slider, #3 to #5.
  • Childrenswear: resin or coil with a covered, pinch-safe pull.

Sustainability considerations

Recycled nylon and recycled polyester tape are now widely available and can carry GRS certification when the supply chain is verified. Resin teeth are difficult to recycle in mixed-material assemblies, though mono-material acetal options exist. Metal is technically highly recyclable, but the plating and the mixed tape complicate recovery in practice.

Whichever family is chosen, the credible claim depends on documentation: transaction certificates for recycled content, and a clear statement of which component the percentage refers to. Vague claims about eco-friendly zippers are common and rarely survive a buyer audit.

A short decision rule

Start with the garment's service condition. If it will be washed often and worn close to skin, choose coil. If it needs structure and lateral strength, choose resin. If it needs to look and feel substantial and will be cared for rather than laundered aggressively, choose metal. Then confirm the gauge, the slider, and the finish against the actual seam construction. Suppliers such as YCC and Donglong can supply all three families, which makes side-by-side sampling practical, and a sewn comparison sample is still the fastest way to settle a material argument.