I sent an old pair of Nikes back to the manufacturer about a month ago. Last week, they sent me a voucher for $125.00. The shoes didn't even cost that much. The Nikes have to be defective. (I cut the air bubble in them.) I got a new pair of Nikes this week. I'm going to send back another pair. I think you can send up to three pair a year. The Nikes have to have been manufactured within 3 years of the return date.