Fusible interfacing is a fabric layer that is added to sewing projects to provide structure, stiffness or support and has a side with a layer of glue. When it is heat activated by an iron, it will fuse to your fabric, immediately giving it more body and sturdiness. It’s easy to use, stays in place and and works on most fabrics. It has easily become the go-to option for interfacing thanks to the convenience and ease of it.