Iron-on Instructions: 1, Put the patch on your clothes/shirt/pants with face up, glue side down; 2, Cover the patch with a cloth in order to protect it; 3, Iron on the cloth together with the patch, around 30 seconds; 4, Iron on another side(inside) of the clothes/shirt/pants, around 30 seconds; Tips: You can sew up the patch with thread, so that it'd be more tight and fastened; Tips: For size, 1inch = 2.54cm, 2inch = 5.08cm, 3inch = 7.62cm, 4inch = 10.16cm, 5inch = 12.7cm;(1cm = 0.4inch)