Remember the good old days when kids sat around playing Super Mario for hours on end? Too bad your little one will have no idea what that's like...they're just going to have ipads. Pshh. The iron-on adhesive backing makes this patch a great addition to a backpack, shirt, hat, or anything you can imagine! Iron-on backing fuses onto any fabric that can withstand ironing. For easy fabric application: 1) position patch on fabric where you would like it to be attached. Press firmly with hand to create a temporary bond. 2) With iron set on high with steam, place a damp cotton cloth (clean t-shirt works great) over the shirt where the patch is placed and press down firmly for 10-20 seconds to create a permanent bond. Repeat if necessary with a freshly dampened cloth. Machine washable without fabric softener. Cool iron with garment inside-out when needed.