I can't help I'm afraid ... I don't really look at the different shoe types. I'm sold on Nike Frees for now, and the benefits that the flexible soles have on foot strengthening. I have four pairs, one with close to a thousand miles on that I still use. With the heavier structured shoes (I used to wear the Nike Zoom Structure Triax) once I got around 500 miles they seemed to feel stiff. The Nike Frees are like slippers and the reasons they'll be dumped is the uppers wearing out.



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