In 2019, Eliud Kipchoge ran the marathon in under 2 hours, breaking all known records, and wearing Nike Vaperfly shoes. Soon people thought about how much Kipchoge’s triumph had to do with his running skills versus his running shoes.
Modern running shoes have three main parts. The upper needs to fit securely, the sturdy outsole hits the surface, and the midsole is where all the action, and controversy, happens. Learn about energy return in the midsole and why some think it gives runners an unjust competitive advantage.