Invisible zippers are the least noticeable of all zippers. As the name implies, the zipper is hidden in a seam, becoming virtually invisible. This makes it a popular choice for elegant clothing sewn with expensive materials, like evening wear. But it"˜s equally appropriate for skirts, blouses, and other everyday clothing items. Invisible zippers (also called concealed zippers) are easily sewn with the PFAFF® Invisible Zipper Foot!