Yeah it's supposed to increase the abrasion resistance. Another sample I received had some issues with the cordura pilling up, so still trying to get that resolved. I just got these today so I have no idea how they'll hold up.
PM me your address and I'll send you a pair, I have a couple samples and could use some feedback anyway. They also kind of messed up the artwork on the bottom of the sock but it's getting changed anyway.
Price is still being worked out but I'm guessing $15.