Unconditionally Guaranteed for Life - Darn Tough warranty
Darn Tough socks are guaranteed to be the most comfortable, durable, and best fitting socks you can buy. In a nutshell, if you wear a hole in them, we will replace them free of charge, for life. Things that generally are not covered—disappeared in the dryer, the dog ate them, too close to a campfire, theft by friend or foe, etc., etc. However, all claims made in good faith will be considered.
I you want to file a warranty claim follow the instruction on the official website.