But the soft and lightweight ZoomX material isn’t very stable, so Nike added a bottom layer of (denser) React foam to the bottom of the midsole to stabilize the ZoomX and improve the shoe’s durability. The top layer is ZoomX, the blown Pebax material that Nike uses in the Vaporfly shoes because it returns more energy than any other Nike material. Despite the “ZoomX” writing near the heel, the midsole is actually two different foams. The Zoom Pegasus Turbo 2’s midsole is unchanged for the update that’s a good thing, because Nike got it right in the original Turbo. React foam (bottom) is more dense, serving to stabilize the ZoomX and prolong the shoe’s lifespan. Observe the split between the two foams: ZoomX (on top) is softer and more prone to developing visible wrinkles as it compresses.
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