I am a marathon runner with a very wide foot. I'm not tiny or super fast, I'm 165 pounds and I'm a 3:08 marathoner. The 1500 line is the best shoe I could find for racing that fits wide feet. I train in Brooks Ghost and New Balance 1080, both size 12 4e. I was very happy with 1500 v5 and now v6. The v6 is a bit more airy but has the same fit. I assume that I will try to qualify again in Boston.