Fit
I must admit, it seems like the Flyknit collection is modeled around a specific foot shape. It’s narrow, and I’ve heard various feedback regarding the shape of the heel counter & excessive foot movement. It may not suit everybody. Yes, the technology behind the woven Flyknit gives it flexibility to ‘wrap’ itself around your foot as well as incorporating amazing breathability for the wearer, but it certainly seems more suited to a certain foot shape than a universal application, especially with the Racer. The Zoom Air is also a bit stiff at first, but does break in over a few runs.