How to wash a new pair of Japanese jeans really stiff?

There is a label that comes with the jeans that is in Japanese, I think is a special way of caring for them, but I have no idea Wat to do. I only mention that they are Japanese b / c I use a different type of jeans or something thus.

Turn inside out and wash in cold water on permanent press. Tumble dry low or permanent press. Good Luck.

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