Below is the first pair of socks I knit for my husband.
These are the gargantuan holes in the heel of one sock.
This was after last week when I meticulously darned a hole in the toe of the same pair of socks and accused him of not cutting his toenails short enough.
The yarn was (what I thought) a good quality, but you can see it's already started to pill more than one would like.
It seems that this pair of socks held up for about two months, being worn once a week, but is now rapidly falling apart.
The other two pair I've knit him he wears regularly (different yarns) and seem just fine.
I don't know how you tell, but beware of sock yarn that doesn't hold up. Or perhaps I should say beware of sock yarn that does hole up. (Haha.)
Drat and darn. (Pun not intended as I'm not going to waste my time darning these socks anymore. For all I know, the way things are going, next the cuff may fall off.)