Nike has launched a mass market version of its controversial Alphafly prototype shoe that it says complies with new World Athletics rules.
The sport’s governing body introduced an indefinite ban on any shoes that have a sole thicker than 40mm or more than one rigid embedded plate or blade.
The prototype shoes worn by Eliud Kipchoge when the Kenyan became the first athlete to run a marathon in under two hours in October do not meet these restrictions.
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