I have worn Wrightsocks while training and in several races; I have calluses on my feet but never a blister.
Same socks as ever. PLEASE don't change them. These are great socks for serious distances.
These socks have gotten me through over 20 marathons and mid-distance trail races, countless half marathons, and at least 7 jaunts across the Grand Canyon for the infamous "Rim to Rim" (not all at once). :D I almost never get blisters, and my original pair (which is at least 5 years old - before the "Running II" version) only has one small hole in the outside layer. Ordering more today because I want them in black. :)
I ordered the wrong style and wrong size so sent it back. I am awaiting the replacement.