Podium-worthy. On and off the course. Building on an award-winning year, the Endorphin Speed 2 is back with its just-right combo of ultralight PWRRUN PB cushioning and a flexible nylon plate. It shines for both speed work and long miles, workouts and race day. Finally, a shoe that works as hard as you do. Rolling in speed SPEEDROLL Technology propels you forward with the feeling of continuous momentum. Its two core variables are elevated cushioning and a stiff forefoot, which together result in an instantly responsive ride so you can run faster, not harder. Versatile energy return The Endorphin Speed 2 combines ultralight and springy PWRRUN PB cushioning with a full-length, semi-rigid nylon plate that’s more flexible than carbon fiber, resulting in a powerful SPEEDROLL effect that works for both speed workouts and races. Lighter footprint This style contains recycled materials.