The Cose Nylon Invisible Zipper, 35cm long and in navy blue, is a pre-assembled zipper with a slider included. Its teeth are hidden behind the tape after application, leaving only a discreet stitching line visible. It's the most commonly used type of zipper in dresses, skirts, and blouses for more elegant garments, where a clean finish without the zipper being visible is desired. The navy blue tone is an elegant and discreet color, often used in more formal dresses and skirts. The longer 35cm length is suitable for dresses with a wider opening along the back. It requires a specific invisible zipper foot on the sewing machine, which allows for correct application along the hidden teeth.