As far as I know, it's a two step process. You create a screen, just as you would be doing a silk screen shirt but instead of using plastisol ink, you use a special glue. You would "flash" dry the shirt for a couple seconds until the glue gets tacky. Then, you take the shirt to your heat press, place a foil sheet on top (you can get them at mclogans or any silk screening supply store- they come in rolls of silver or gold) and press it for about 15 seconds. The foil adheres to the glue and not the shirt, and wah-lah! Your design is foiled!