Saucony Endorphin Speed 4 vs Nike Zoom Fly 6

The Nike Zoom Fly 6 and the Saucony Endorphin Speed 4 are both positioned as super trainers, designed to bridge the gap between daily trainers and race-day shoes. The Zoom Fly 6 features a higher stack and full-length carbon plate, paired with a thin ZoomX top layer over firmer SR-02 foam, delivering a rockered, stable ride with good cushioning. In contrast, the Endorphin Speed 4 uses a plastic plate and PWRRUN PB foam, resulting in a ride that feels more energetic and responsive, but also firmer and less protective, especially under the heel. While both shoes can handle steady runs, up-tempo workouts, and occasional racing, the Speed 4 is lighter, bouncier, and better suited for runners who want a livelier, more grounded underfoot feel.