I used them on my husband's soccer league jersey, 100% cotton t-shirt. Maybe it's common sense, but you cut out the correct number, place it on the shirt white side up, iron the back of the shirt, and then iron the front of the shirt. The white part was difficult to separate, and in fact left 2 white spots. You can iron the numbers again after cleaning up the white. I used to make numbers with fabric paint, stencils, and freezer paper. They require a lot of preliminary work, but the results are better in my opinion.
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