Backed by a dry adhesive film that is activated by heat, HeatnBond interfacing forms a no-sew bond three times stronger than other traditional fusible web without adding weight or stiffness. Choose medium weight as an all-purpose for medium or heavier fabrics. Use on; medium cotton, light denim, flannel, fleece, linen, light wool. Ideal for shirts, collars and button holes. With a low temperature and short pressing time, it allows for a wider range of materials to be bonded. There is no steam or pressing cloth needed, and it will not lift or pucker after washing. Machine washable, dry cleanable. 100% Polyester.