Sulky Fuse ?n Stitch stabilizer is a permanent, firm, crisp, heavyweight, iron-on stabilizer that is ideal for projects that need extra stiffness and retained support. Provides a permanent fused stability to stitch on all medium to heavyweight fabrics for more professional looking results. Especially suitable for high-stitch count or high-stitch density embroidery designs. The precision dot coating will allow bubble-free adhering. Its grid-like structure folds a perfect edge. You can use as an iron-on permanent interfacing, too. All Sulky stabilizers are acid and lead free!