Supposedly a life span warranty, but for the money if we receive a calendar year or two out of them we'd be happy. Up to now, we like them much better than merino as our feet feel to remain drier. And so they seem to be holding up properly. Ha! https://trentonxltxf.dbblog.net/5843413/getting-my-thigh-high-compression-socks-20-30mmhg-to-work