Nike Vaporfly shoe controversy sparks World Athletics to introduce new rules ahead of Tokyo 2020 Olympics - ABC News
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IAAF steps up investigation into fears over springs in Nike running shoes | Athletics | The Guardian
Nike's high-tech, record-breaking Vaporfly marathon shoes should be banned, Rob de Castella says - ABC News
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Nike's lightning shoes hint at power of technology to skew elite competition | Athletics | The Guardian
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