Aurifil’s Monofilament Invisible Thread Made in Italy, is made of nylon. It is the perfect choice, whenever the thread or the stitching line should camouflage or needs to be absolutely invisible. Aurifil’s Monofilament Invisible Thread can be used as a top thread for many quilting applications such as stitch-in-the-ditch, invisible machine applique, outlining, shaping and echoing applique and of course free motion quilting.