do you have the invoice at the time of purchase? If there is any quality problem within 7 days, it is guaranteed to be replaced! The invoice mainly proves that your purchase time is within 7 days. My colleague bought a pair of Samma pants, and after washing them, he found that the diagonal of the pants was off. I still want to change them when I get Samma. Don't worry, I can change them. I hope I can help you! !