Finally, use a rolled up towel inside your shoe and a scrap piece of fabric in between the iron and the
surface you are heating to permanently attach the patch to your
project. If you are adhering your patch to shoes,
make sure to avoid heating the rubber sole of the shoe.
Make sure to check the fabric type you intend to iron your patch
onto -- some synthetic fabrics will melt when exposed to high heat,
which you'll want to avoid. Also, pay attention to the instructions
on your iron-on webbing.