Altra Women's One 2.5 Running Shoe, Black, 8.5 B US

The new one 2.5 is built for speed, without sacrificing the comfort needed to maintain it through the finish line. A footshape toe box lets your toes relax and move freely for incredible comfort, extra stability and a more powerful toe-off. Inner flex technology adapts to the flexion of your foot with omnidirectional flex grooves in the midsole. Responsive a-bound cushioning protects the feet at impact and rebounds to add a spring to each step. The weight-balanced, zero drop platform helps you maintain low-impact form, even when fatigue sets in at the end of a hard race or workout. Go fast, go hard and stay comfortable from step one to the finish line with the new one 2.5.