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How old are the shoes?
Nike typically has a very good return policy for shoes within the 2 year manufacturer date. They first want you to try and return the shoes to the place of purchase. If they cannot be returned there, then you will have to contact Nike directly.
The phone number to get a claim number is XXXXX I have attached a link to the Nike returns so you can read about the specifics of what you will have to do.
Good luck with your shoe return.