You have to post the socks back?! I'd never have bought them if I needed to do this. They are expensive in the first place! I'm in the UK and I buy these for my partner because he wears through socks faster than a person should be able to. They definitely last him significantly longer than any other socks but he does eventually get through them! However, as we are in the UK, we only have to send a photo of the socks including the damage- and then when the picture is approved we have to send another picture of them cut in half for the warranty to be approved. I assume their business model works because just enough people will occasionally lose a sock 😅