The Endorphin Pro offers a smooth and efficient yet snappy and responsive ride to help get your ready come race day Engineered mesh upper Carbon plate is designed for longitudinal stiffness and maximum metabolic efficiency High energy PWRRUN HG foam cushioning Energy returning PWRRUN PB foam cushioning helps propel you forward Smooth SPEEDROLL technology for effortless speed, smooth turnover, and propulsive forward motion Saucony Men's Endorphin Pro 4 White Black