i carried 2 pairs from maine to georgia on the appalachian trail and they still look as good as the day i bought them! very impressed with the quality and durability. i paired them with injini toe sock liners and could wear a single pair for days on end with no washing.
With one pair I have ran over 1000 miles, including the leadville 100, speedgoat 50k, mcdowell mountain frenzy 50k, and still no holes. I never had to worry about changing them in river crossings as they dried quickly. I have ran in temps from -10F to 95F with complete comfort Highly recommend this one.