Last month, elite marathoner Eliud Kipchoge ran 26.2 miles in less than two hours, breaking a barrier some thought impossible. The following day, fellow Kenyan Brigid Kosgei shattered the women's marathon record. The common thread for both performances: the shoes on their feet. Kipchoge was running in a prototype featuring Nike Inc.'s latest Vaporfly technology. Kosgei was wearing an earlier version of the same shoe, which retails for $250.
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