World Athletics ruled Friday that a shoe recently developed by U.S. sports equipment manufacturer Nike Inc., can be used in competition at this summer's Tokyo Olympics.The shoe, marketed by Nike as the "Vaporfly," incorporates a carbon fiber plate fused with a foam layer that acts like a spring, ostensibly propelling runners forward with each stride.World Athletics' new rules prohibit shoes with soles thicker than 4 centimeters and with more than one plate -- unless the second plate's only function is to attach spikes to the shoe.The body also said that from April 30, only shoes that have b…READ FULL ARTICLE
