My experience is that sock makers have changed the way they make socks. Most of them have gone from a fully knitted sock, to one having a sole equivalent to a looped pile rug. One with a very thin weave supporting the loops. This makes the sole feel thick and cushiony, but also more prone to holes, when the thin weave fails.
Occasionally, I find fully knitted socks, and they last much longer.
It was a tommy gun. And now this tiny ad insists on being addressed as "Tommy":
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