How to Iron 1. Heat the iron to a moderately high temperature that would not burn the fabric 2. Place the patch in the desired position & place a pressing cloth (handkerchief or pillowcase) on top to protect the patch 3. Press the iron down for 15-30 seconds, depending on the fabric 4. Let sit for 1-2 minutes until fabric is no longer hot Sewing: for some backpacks, hats, and heavy fabrics the iron-on method may not work well with heavy materials. If that is the case consider machine or hand sewing them on