Supposedly a life span guarantee, but for the money if we obtain a year or two out of them we'd be happy. Thus far, we like them much better than merino as our feet feel to remain drier. And they appear to be Keeping up nicely. Verywell Fit's information is https://fayde-aur-nuksan-bataye04578.bloggosite.com/39255968/the-2-minute-rule-for-best-socks-for-tennis