Unlike the Zoom Fly, with nearly identical stack heights and midsole geometry, the lighter weight (by approx. RoadTrailRun first tried on a single VaporFly 4% at the Boston Marathon here, tested and reviewed the heavier, "similar" Zoom Fly ($150) here and now have had a chance to take a first run in a pair of our own.
2mm less stack heel and forefoot than Zoom Fly) Stack height: 31mm heel/21 mm forefoot, 10mm drop. approx.1.6 oz/145 g less weight than Zoom Fly) My production pair in US size 8.5 weighed 6.56 oz /186 g, so a size 9 would weigh approx. Official Nike weight: 6.5 oz/184 g size 10, equivalent to approx. Added to running economy are the ideal training, course conditions and nutrition required to break the magic barrier. The Vaporfly 4% is the product of extensive bio mechanics and materials research as part of the goal of Nike's goal of breaking 2 hours in the marathon, the 4% representing Nike estimate of the potential improvement in running economy, with individual runners varying up or down from the shoes.
It was worn by both the men's and women's winners of the 2017 Boston Marathon. The Nike Zoom Vaporfly 4% ($250) is the non customized version of the shoe worn by Eliud Kipchoge at the recent Breaking 2 attempt where he ran the fastest (unofficial) marathon time of 2:00.25.
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