Here's a reprise of one of my favourites from Schoeller and Stahl: Fortissima Socka Mexiko Color - Vino #9042; 420m/100g; 75% Wool 25% Nylon
This was introduced several years ago and then brought back after great cries and gnashing of teeth when it was discontinued. I don't know if they are still putting it out, but when it came back the second time I wasn't taking any chances and grabbed more than my share.
This pair is size Large, knit with the 72 cylinder and 36 ribber on the Verdun 47.
I have a pair myslef, a few years old now, that are knee socks. I wear them over my jeans (used to have a pair of XC ski knickers but they don't seem to make them anymore,that I've seen) in winter for cross country skiing and snow shoeing. They've got a lot of miles on them, been through the washing machine a zillion times, and even the dryer from time to time. No pilling, and, so far, no thin spots.
A good sturdy sock yarn.