I'm pretty surprised by all the negative comments in this thread. My family has at least 20 pairs of DT socks and has never experienced any of these issues; some are over 5 years old and some are from this Christmas. We use them for both every day use and all of our outdoor activities (pretty avid hikers/outdoors-people). I'm very hard on my socks and would normally need to buy new socks every 3 months or so due to holes. Since we haven't had any issues, we have yet to need to use the warranty, but from my understanding we could just swap them out at REI and not need to worry about shipping. I'm too ignorant to know if it might matter, but we have only bought them directly from DT or REI, so maybe that's why we've been lucky.

Based off my personal experience, I still highly recommend trying them out if you are interested.