You will need to test the shirt as soon as you get it.  Originally, I had to return a shirt because the LED were not working because the shirt had an extreme fold on the LED pad.  The shirts are very thin for a T-shirt so I don't think you can even hand wash them too many times before they start to fall apart. They are fun if you intend to wear them 2 or 3 times.  Overall, I would not buy this shirt unless you intend to wear it 1 or 2 times.