Nike Vaporfly 4 vs Asics Metaspeed Sky Paris:
Which to Choose

These two shoes are far more alike than different: both pair a springy PEBA foam (Nike's ZoomX, Asics' FF Turbo Plus) with a full-length carbon plate, both ride tall and narrow, and both feel vague and tippy at jogging pace but come alive the moment you commit to a real race effort. The decisive differences are geometry and intended distance. The Metaspeed Sky Paris runs a lower 5mm drop over a taller stack — about 39.5mm at the heel and 34.5mm at the forefoot — which rewards a forefoot-to-midfoot strike and gives more foam underfoot for going long; it genuinely excels at 10K through the marathon, with the marathon as its clear sweet spot and no 5K in its range. The Vaporfly 4 uses a steeper 8mm drop over a lower stack (roughly 35mm heel, 25.5mm forefoot), a slope that's friendlier to runners who touch down slightly further back and want quick, tipped-forward turnover; it covers a wider span from the 5K up to the marathon, with the 10K-to-half as its sweet spot. The Vaporfly is also the lighter of the two — around 165g versus roughly 178g for the Metaspeed in a men's 9 — reinforcing its edge at shorter, faster efforts, while the Metaspeed's extra stack and lower drop lean toward sustained marathon pace. Both trade outsole and upper durability for speed, so neither is a shoe you want to burn on daily training.