The Hemline 100% Nylon Invisible Sewing Thread Spool is made from high-quality nylon material, ensuring that it is strong, durable, and long-lasting. The thread is perfect for achieving invisible seams, hems, and other stitching where you don't want the thread to be visible. The nylon material makes it perfect for sewing lightweight and sheer fabrics such as silk, chiffon, and organza, as well as heavier fabrics such as denim and leather.