This is a large square cut piece of iron-on backing for a patch that will come separately from the patch. The piece will come bigger than your patch, and You can cut it to the exact size you need for your specific application.
This backing will allow you to to attach the patch to various fabrics without sewing. Iron-on patches can be applied to non-stretch fabrics using a household iron or a heat press, usually found in most fabric or craft stores. When applying iron-on patches, use medium heat (250-300 degrees) and hold for 8 to 10 seconds. You will need to protect the surface of your embroidered patch and your iron by placing a thin material, such as a pillowcase, between the iron and the surface of the embroidered patch. Not using a protector between the patch and iron, or using too high a heat, may cause damage to the patch (melting) and that may transfer to the iron, which will ruin the iron.
Iron-on patch backing can also be used to hold your embroidered patch in place while you sew the perimeter of the patch to the fabric. It is not recommended that iron-on patches are put on fabrics that are elastic, or on materials that may be damaged by the heat of an iron or heat press.
Steps to apply the backing:
Use a clean towel or butcher paper to protect the ironing board from the sticky adhesive
Put the patch face down on an ironing board.
Cut the patch backing into a rectangle that is a bit bigger than the patch.
Put the backing paper side up (the 'sticky' part should be touching the patch)
put some scrap fabric like an old pillow case over the patch and backing
Use an iron on medium heat for 8-10 seconds and press down
Check to make sure it adhered. If not, use the iron again.
Once done, cut out the patch backing along the edge of the patch.
Peel off the paper backing, and the patch is now ready to be ironed on to something else.