Great for decorating jeans, jackets, bags, t-shirts etc. I recommend stitching around fully (or just at select points) for extra security after ironing into position.
To attach: Place the patch where you wish it to adhere. Cover with a cotton tea towel (or similar). Iron for 15-30 seconds keeping the iron moving, do not use steam. Stitch at critical points for added security. Enjoy! :)