Crazy Man Socks - Fixed
These lasted 20 months of hard boot use before developing a hole, so slightly longer than the black pair discussed previously. I am not sure if the difference was due to the yarns (roughly similar fiber other than these have 7% PBT, whatever that is), needles used (0s for these, 1s for the other), or just frequency of use (the black ones were slightly preferred). In any case, these held up really well.
The feet of these felted slightly after only a few wearings, but that only made them more warm and durable. All and all, I think Mega Boots Stretch sock yarn really does live up to its name. It does make great hard-wearing boot socks.