Shop Skull Patches. Small or Large. All embroidered, all can be sewn or ironed on. If you are putting them on leather then Sew on the Patch. If it's going on a denim shirt or pants you can easily iron them on. Just be sure to follow our exact instructions. If you don't get the temperature right, the patch will not iron on properly. 275 Degrees Fahrenheit and 30 seconds with a household iron does the trick.