Brand positioning and origin

KOC is a Swiss zipper brand within the RIRI group, positioned in lightweight and concealed constructions rather than the parent brand's metal speciality. The division of labour is deliberate: metal for the luxury metal segment, coil and invisible articles for garments that need a soft, discreet closure.

Swiss production at this level emphasises consistency and finish rather than volume. A KOC invisible zipper is judged on how cleanly it disappears into a seam, how evenly the coil rolls and how reliable the slider remains after repeated use in a fitted garment.

Product range

The range focuses on coil and concealed articles:

  • Nylon coil zippers in #3, #4 and #5, closed-end and open-end.
  • Invisible coil zippers in #3 and #4 for dresses, skirts and trousers.
  • Two-way and separable coil versions for lightweight outerwear and sportswear.
  • Tape colour matching to garment fabric, with tonal thread options.
  • Low-profile sliders and slender pulls suited to fine fabrics.

Typical applications

KOC articles are used in womenswear, dresses and skirts, tailored trousers, blouses and light jackets, lingerie and swimwear, and fine knitwear. The invisible range is common in garments where the closure must be undetectable from the outside, including lined dresses and formalwear.

Quality and compliance

Coil articles are tested for slider smoothness, coil recovery, tensile strength and colourfastness to washing, perspiration and light, with strength references to ASTM D2061-style methods. OEKO-TEX Standard 100 documentation is available for apparel articles. Test reports and certificates apply to specific articles and are subject to the supplier's certificates.

Sourcing notes

As part of a European group, KOC is supplied on quoted lead times with moderate minimum order quantities per article and colour. Sampling takes roughly two to three weeks; special tape colours add time. Bulk production typically runs six to eight weeks. Buyers working with fine fabrics should request samples early to check seam behaviour before bulk approval.