Mens SAUCONY ENDORPHIN SPEED :: From tempo workouts to race day, roll forward faster in the allnew Mens Saucony Endorphin Speed. Feel constant momentum with new ultralight and springy PWRRUN PB cushion powered by a nylon plate (more flexible than carbon fiber) snapping back to push you on. Go faster, not harder with elevated foam and a firmer forefoot creating responsive SPEEDROLL instantly. Pass your PR with FORMFIT giving the Endorphin Speed the most personalized fit ever by Saucony.