Nothing at all against the prior poster . . . he may be great. I have run in DeFeet socks since the early '90s and think they are the best (for me). They have a custom program that I use for my office and charity. I believe the minimum for a custom order is a gross. I order a gross every other year or so and they have been great to work with. Let me know if you need more information. I have no connection to them other than being a long time customer.
David
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Disclaimer: I have personal and professional relationships with many athletes, vendors, and organizations in the triathlon world.