big printed on them is to be careful how you fold them. you want to avoid folding the shirt so that print is not folded over on itself. it may stick together a little causing you to pull it apart when the time comes to wear it. such action over time may cause additional wear and tear on the print and it may not last as long as you would like. you may also want to avoid folding the print itself, especially if it is a large one, because it may have a tendency to hold the crease after you unfold it, meaning you may need to iron the shirt.
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