The Nike Free series of running shoes offer the closest thing to a barefoot ride, providing comfort, support and maximum flexibility. It's only fitting, then, that the newest installments of the Nike Free franchise -- the Nike Free Run +3 and Nike Free 3.0 -- have launched on NIKEiD, which means runners have the flexibility to customize the shoes to their own personal preference. They can even customize the performance element by mixing the upper and outsole from the two styles to create a Nike Free hybrid. Both models share a feature that's new to the Nike free series in the form of arch siping, in which trans-tarsal diagonal cuts in midsole enhance natural motion flexibility and help increase foot strength. Go to NIKEiD now and work out your creative strength by customizing your own Nike Free Run +3 or Nike Free 3.0.