Nike's controversial Vaporfly shoes are helping runners set new records, but some think it's 'technology doping.' Here's how they work.

Business Insider

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· The winner of this year's New York marathon, Geoffrey Kamworor, and the world marathon record holder, Eliud Kipchoge, both wear Nike Vaporfly shoes.
· Research suggests Vaporflys give runners more energetic efficiency because the shoes' foam-and-carbon sole structure ensures less energy is lost with each step.
· One...

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