COATS&CLARK-Zipper. Soft, flexible and strong closed bottom zipper that was designed for comfort. Coats Polyester All Purpose Zipper features a coil zipper with a flat covered back so that the zipper is smooth against the skin. The coil is woven into the polyester tape so that it is split resistant, and the zipper does not need to be preshrunk! This all-purpose zipper is ideal for use in pants, skirts, dresses, sportswear and home decorating items. This package contains one 18in zipper.