Odin Large Large Back Embroidered Patch for Vest Iron On Viking Biker Patches Skull Patch. All our patches comes with high-quality iron-on adhesive to place them wherever you like. How to apply the patch: 1 - Heat the iron on the highest temperature for the adhesive to melt properly. 2 - Place the patch in the area of your preference. 3 - Make sure the area is clean and there are no wrinkles. 4 - Place a cotton cloth on top of the patch. 5 - Carefully iron the cloth from one side to the other for a few seconds. 6 - Turn the garment inside out and repeat steps 4 and 5 again. 7 - Let it cool down. And now you can wear your patch!