Well, this is my last pack I am purchasing.  I bought a bunch in July 2017 and by December 2017 most had holes and were falling apart in the bottom center.  I received another batch in December from the holidays, I did not remove it from my list, and already in March 2018 some have started getting holes.  The holes are happening at the seams.  The material otherwise seems to be fine, it is just poor craftsmanship.  ... I should add that I had about 18 pairs total of various types so it isn't like any of these were getting worn more then twice or three times a month.