he Endorphin Pro was engineered with elite athletes and built to give runners a fair advantage at the starting line. Featuring propulsive SPEEDROLL Technology, our signature S-curve carbon fiber plate combines with ultralight PWRRUN PB cushioning for powerful race-day performance. And weighing in at just 7.5oz, it's undeniable. These shoes weren’t made for chasing personal bests. They were made for smashing them.