Invisible zippers are a type of zipper designed to be hidden from view when the garment is closed. They are commonly used in clothing, such as dresses and skirts, to create a seamless look. The zipper teeth are placed on the back side of the fabric, allowing the front to appear smooth and uninterrupted. These zippers are typically made from nylon or polyester and come in various lengths and colors. To install an invisible zipper, a special foot is used on a sewing machine, ensuring that the zipper is sewn in neatly and remains discreet. This feature makes them popular in fashion design and tailoring.