Bass Pro has a Red Head heavy weight wool sock American made ,it is the best sock I ever wore .I have used everyone ells es socks and these are by far the best I have used .Try a pair you will not be disappointed. They were part of my sons Christmas present a couple of years ago.

I.might be wrong ( won't be the first time ) but, marino wool is smart wool.
I looked up Bridgedae wool socks, the heavy wool is still only 51% wool, that might be why they last a long time as other fabrics will resist friction better than wool.

I have found marino wool ( smart wool ) to be very good, but when it gets really cold, I put on my alpaca wool socks. Both of these are 100% wool, and have been worn a lot and they show no wear. I'm sorry but I can't remember the name of the company. I can tell you I get the from the old timer sock guy who works the various outdoor shows.

I looked very closely at buying some Darn Tough socks. To me, they look hard to beat.  I'll buy some for my wife for Christmas and see how she likes them.  Then she'll let me buy some for me.  
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