Inside the Vaporfly: So Fast It Was Nearly Banned.The 11 Best Nike Running Shoes You Can Buy.The midsole’s thick heel and rocker shape ease the strain as you roll through your stride, a process accelerated by the apparent “ramp” and high arch in the shoe’s midfoot. The Infinity Run scored average-to-low for energy return, consistent with other shoes with React foam midsoles like the Zoom Fly 3, yet it feels energetic. Sometimes, the numbers betray a shoe’s actual behavior on a run. The midsole tested “very soft” in mechanical impact testing at the Runner’s World Shoe Lab, and it feels that way, as if there’s no bottom to the cushioning when you touch down. So not only is there a lot of material beneath your foot-the men’s and women’s shoes have heel thicknesses of 33mm and 31mm, respectively, solidly in Hoka territory-but most of it is React foam. The shoe’s rocker-shaped React foam midsole has 24 percent more foam than its predecessor, the Epic React 2, and Nike minimized the material between you and the foam using a thin sockliner and no strobel board.
It’s worth it for the dynamic ride, and running on a hunk of bouncy React foam is good fun, too. Minor gripes: Flyknit Loft breathes well but provides little cold- and wet-weather protection, and the ankle collar irritates bare skin-easy fix: wear crew socks. “It almost molded to my foot.” The material doesn’t stretch much, which is good for stability, although some wide-footed testers found it constricting. “I loved the knit bootie construction,” said one tester.
Up top, a snug-fitting Flyknit Loft upper keeps your foot locked in place. So the shoe is soft yet responsive underfoot, which suits most types of on-road runs.
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