These *do* seem to be pretty durable, which was a problem that I had with Hanes in the past.  However, though I'm size 10.5, and these are supposed to be size 10-13, they are *very* tight and uncomfortable.  Also, they don't breathe in the least, so when hiking they are very hot, and very smelly when I take off shoes (which has not been an issue with other socks brands).  So I'm going to look for something else.  Too bad I got 2 full packs of them.