D'arcy And Goran

The world's greatest marathon runners are flying like never before – and many experts are putting the astonishing times down to a running shoe.The Nike ZoomX Vaporfly, launched in 2016, has zoomed into the headlines, and is threatening to become as famous as Kenya's record setting stars Brigid Kosgei and Eliud Kipchoge.The shoe, which has a few versions, sells for up to $650 on the internet (and one supposed limited release model is being sold out of Britain for $2000). They are half that price out of official New Zealand suppliers, while the latest incarnation sells for nearly $500 in Europe.But it is also dividing the athletics world with at least one stable of runners, aligned to a rival company, calling on authorities to examine the shoes which they claim are "ruining" the sport, stating they "don't want to continue with unfair athletics"Equipment disputes are certainly not a new argument in sport – golf is perhaps the most obvious recent example, where rules around how long putters are used have been rev