Announcing the new regulations for admission is World Athletics that has fixed the maximum length of the sole at 40mm, with only one plate in the midsole, while also establishing that they must have been available for purchase by anyone for at least 4 months prior to competition. So, no prototypes will be admitted. This will accordingly exclude excellent shoes like the Nike Zoom Alphafly Next with which Eliud Kipchoge ran the marathon in Vienna in under 2 hours. The American company of sportswear will accordingly have to settle for Vaporfly’s admittance into the event. Also Adidas, which had shown its prototypes during their testing phase, had to take a step back because of its soles that are over the height limit and the multiple plates of its midsole.