This 336 heavy weight canvas sew in interfacing is suitable for both outerwear & craft applications. Suitable for medium to heavy weight fabrics. Made from a cotton blend, this high-quality interfacing bonds to fabric when pressed with heat, enhancing durability and providing a smooth, professional finish. Unlike non-woven interfacing, woven interfacing has a fabric-like structure, ensuring it moves naturally with your fabric. We recommend performing an application test before processing the product. To use press the iron on step-by -step for about 12 seconds, using a damp cloth. Do not push. Washable at 40%.