In a sport decided by hundredths of a second, bobsledders are turning to an unlikely source for marginal gains: the insoles inside their shoes. View this story and more Olympics coverage here.
Inside the shoe: How a quiet piece of tech is shaping the start of a bobsled run
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Bobsled shoes typically are tight to the foot with hundreds of spikes on the sole, allowing for grip during the push start of a bobsledder's run.
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