The Zoom Fly 4 has been 2 years in the making and surprisingly, it maintains the same midsole-outsole as the Zoom Fly 3 and it only receives a new upper.Ģ021 really is the year of the upper for Nike with the Pegasus, Vomero, Structure, Miler, Vaporfly Next% and Infinity Run also only receiving just an upper change. A more fitting name for it would have been the “React Fly” or the “React Vaporfly”. The name “Zoom Fly” also isn’t a great name for it and it’s misleading because it has neither Zoom Air nor ZoomX in its midsole. To me, all the previous versions of the Zoom Fly have been poor training counterparts to the Vaporflys. I’ve found the Zoom Fly midsoles to feel underwhelming underfoot and their uppers uncomfortable. Up to now, I’ve never been a big fan of the Zoom Fly series.

The original Zoom Fly was way ahead of its time and was a trendsetter. Since then, other training companions like the Endorphin Speed, FuelCell TC, Tempo Next%, Deviate Nitro and the Boston 10 have also joined this relatively new category.

Back in 2017, when the original Zoom Fly was launched, it was the very first training companion and it was designed to be a more durable, cheaper version of the revolutionary Vaporfly 4% racer.

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