SUPER FOAM: Relish the soft cushion of PWRRUN PB while you put in daily miles, and feel the power of the foam when it’s time to pick up the pace DURABILITY & TRACTION: The XT-900 rubber outsole is engineered to withstand the miles with you, placed where you need it to get the most out of your runs. SPEEDROLL: A hallmark of the Endorphin series, SPEEDROLL is designed to enhance your transitions, creating a smooth, faster and more efficient ride. 8mm Offset