In reply to Fishmate:
> I'm not sure what others are doing to get holes,
In the case of a Powderhorn MAPP merino top (same fabric as Arc'teryx use), simply wearing it in bed. And no, I don't have an adventurous sex life...
I have CoolMax base layers I've worn for years, washed with utter abandon, and are still looking fine.
Wool is fragile; it's contructed from relatively wool fibres spun into a thread and then woven. It's pretty easy for these fibres to fray from that thread bundle. This is not true of synthetic monofilament spun threads, at least, not without damage to the monofilament.