Nike's controversial Vaporfly shoes are helping runners set new records, but some think...

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The winner of the 2019 New York City marathon and the fastest marathoner in the world share a few things in common: They're both from Kenya, they train together, and they wear Nike Vaporfly running shoes. Geoffrey Kamworor wore the shoes on November 3, when he finished the New York marathon in 2 hours, 8 minutes, and 13 seconds. Eliud Kipchoge, who holds the world marathon record, donned a Vaporfly prototype last month when he ran the first sub-2-hour marathon ever. In fact, the $250 neon shoes (they come in bright green, pink, and orange) have been involved in nearly every major running milestone for the last three years. But some runners and researchers think the footwear confers an unfair

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