Material used for the upper is slightly stretchy with large cutout pores at the forefoot area for breathability. I suspect this is designed as such to help locked down your feel along with the mid foot area through the laces. The upper has no visible frame structure except for the heel counter which is slightly padded with an angle towards the heel/archilles. The upper is constructed using a layer of soft engineered mesh, however the upper layer is a lot thinner than any of Nike's shoes range like the Flyknit shaving off fats. With a 4mm drop from a stack height of 22mm heel and 18mm forefoot, weighing-in just a mere 5.3 oz for half a pair of the US size 9, this is as light as you can get without sacrificing durability. Honestly, I don't have any experience with racing flats, my racing pace is pretty average and most often than not I really don't need a racing flats, but this beast changed my view.
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