Hair Canvas Medium Weight Hymo Interfacing - 2 Yards x 66" Wide This is a woven fusible interfacing suitable for garment construction where crisp detail or firm control is desired. There is no need to preshrink interfacing. Always test interfacing on a scrap of fabric before applying to garment. Do not use in triacetate seersucker lace or rainwear fabric. Use with medium to heavyweight fabric.