The governing body published updated guidelines which limited the use of prototype shoes like the hi-tech Nike style worn in a sub-two hour marathon run by Eliud Kipchoge in Vienna in October.
World Athletics set a guideline taking effect on April 30 that a shoe must have been available to buy for at least four months to be eligible for use in competition. “I believe these new rules strike the right balance by offering certainty to athletes and manufacturers as they prepare for the Tokyo 2020 Olympic Games.”
“With all due respect to Kipchoge, as he is clearly the greatest marathoner of all-time regardless of the shoes he is in, when a shoe company puts multiple carbon fibre plates in a shoe with cushion between the plates it is no longer a shoe, it’s a spring, and a clear mechanical advantage to anyone not in those shoes,” Hall wrote on Instagram last year.
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