100% polyester for bold color and durability. Strong merrowed edge. Adhesive backing for easy application. Attach to clothing, hats, or your favorite gear. *Note: This Patch can be ironed onto a garment of your choice. Suggested guidlines:Iron on the hottest setting.Use parchment paper or a heat-resistant layer between patch and iron and leave the iron on it for up to a minute.Allow to cool before testing to see if the patch has adhered.