The Endorphin Pro 4 is built for your fastest moments. Engineered to deliver explosive propulsion and unwavering efficiency, it fuses PWRRUN PB and PWRRUN HG in the midsole, an industry-first combo that powers every stride. A full carbon plate adds stiffness and energy return, while the silky-smooth heel liner and integrated tongue system make it feel like slipping on an old friend. Come race day, it’s not just a shoe—it’s your edge. Women’s size 9 Worn for about 15 miles total. Plenty of life left in them for a few more races.