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Nike's rivals play catch-up in marathon shoe wars

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Nike's rivals play catch-up in marathon shoe wars

Elite athletes wearing versions of the Vaporfly, the carbon plates of which lend a propulsive sensation to every stride, have set a rash of personal bests and Nike runners have practically swept the board in long-distance events -- they took 31 of the 36 podium places at the six marathon majors last year.

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