This is an embroidered patch with plastic iron on backing and embroidered clean cut borders. You can sew or iron on this patch. When attaching patches to leather or nylon material you must sew on the patch. Heat will scorch the leather. You can iron on the patch to materials such as denim, cotton, or anything else that can withstand the required temperature of 270 degrees fahrenheit. You can use a household iron to iron on the patch, however the correct temperature setting is very important. It is not any cotton or silk setting shown on your iron. You need to find the correct setting of your iron that will yield a steady 270 degrees temperature for about 30 seconds. Household iron's are not designed to hold steady at a fixed temperature. This is why most of the time an iron on attempt might fail at first. There is no magic trick to iron on a patch. You need the correct temperature. If you have a heat press, you can punch in the temperature setting to 270 degrees fahrenheit and 12 seconds timer. If you fail at ironing on your patch the first try, you can always retry to iron it on as long as you haven't used too high of a temperature causing the glue to lose it's properties. This can happen, if you use a very high temperature setting, you can begin to melt the plastic into the glue. Please note you are trying to activate the invisible glue over the plastic. You are not trying to melt the plastic on to the clothing! Disregard every youtube video you've seen about cranking your iron to the highest setting. If you do this, chances are your patch won't attach properly to your clothing. If your only option to iron on is using a household iron then we recommend using a frying pan thermometer to find the correct setting of your iron that will yield a 270 degree steady temperature. You should apply this heat for about 30 seconds to the patch. No need to move the iron around.