I bought my first Wrightsock Men's Coolmesh II socks in 2004 (as of 4/29/2018, that is 14 years ago!). They STILL are in use. They are great on trips keeping your feet cool in sandles and shoes while you walk miles.  The double layers keep you from getting blistered.  I wear them with dress shoes to work. They last forever.
However in comparing my original socks and my newer purchase there are problems:
1) the newer socks SHRINK - see photo. The original ones did not shrink. So GET A SIZE LARGER OR TWO. Unfortunately XL is the only size larger for me. I wish there was an XXL size because of the shrinkage.
2) the newer socks are Gray PLUS A BLUE-TINT - see photo. They aren't pure gray like the original ones. They don't look as nicely formal as the original socks I bought in 2006. As a result, I don't wear the newer socks with dress shoes. I'll have to use the black version.