Alphaflys banned, but Nike Vaporflys allowed in Tokyo Olympics

The controversial Nike Vaporfly will be allowed at the Tokyo 2020 Olympic Games, but a World Athletics ruling has effectively banned the prototype Alphfly shoe until further testing is carried out.
The shoes have garnered controversy as a series of world records in long-distance running have tumbled over the past few years. Most famously, Eliud Kipchoge run the first sub-two hour marathon last October wearing the Nike Alphafly, although the feat was not an officially ratified record.
The Vaporfly, which is available on the market for £240, and it’s follow-up the ZoomX Vaporfly Next% give athletes up to 4 per cent increased metabolic efficiency, according to Nike, using a carbon-fibre plate embedded in a cushioned sole to effectively propel a runner forwards and reduce lost energy with each stride.
The Alphafly is the bespoke version worn by Kipchoge in his marathon feat, with an even thicker sole containing three carbon-fibre plates and two layers of ‘cushioning pods’ at the front.

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