"The shoe absorbs a lot of pressure from the asphalt," he says in the documentary. ZoomX is softer than its predecessors, offering athletes more comfort as it's compressed. Kipchoge said the shoe also helped him recover. "So for two athletes of equal ability on race day, the one with the shoes is going to beat the one without the shoes." "The runner runs the race, but the shoe enables him or her to run it faster for the same effort or ability," Geoff Burns, a kinesiology researcher at the University of Michigan, previously told Insider of Vaporflys. The addition of the carbon-fiber plate helps the foam compress and expand quickly. By comparison, the ethylene foam in older running shoe soles gives back 60% to 70%. After it gets squished, the resilient foam bounces back to its original shape, returning 85% of the energy that the runner used to compress it. It did not count as an official marathon world record, because standard competition rules for pacing and fluids were not followed, and it wasn’t an ‘open’ race. Kipchoge ran 26.2 miles in the time of 1:59:40, on a special course in Vienna, Austria. The foam in Vaporflys, which Nike named ZoomX, relies on a material called polyether block amide, or Pebax. Some will argue about the details, but the facts remain remarkable. Comenzó como atleta de 5.000m, y a los 18 años superó a los dos más grandes del momento, Kenenisa Bekele e Hicham El Guerruj, en la final del Mundial de 2003, en París. Ni atleta con más necesidad de enfrentarse a sus límites y a los de su prueba. The key is the shoes' lightweight carbon fiber and foam sole, which minimizes the energy lost per footfall. Pero no hay maratoniano más grande que Eliud Kipchoge. Account icon An icon in the shape of a person's head and shoulders.
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