These shoes were created using motion capture technology to meet the needs of the female runner. A women's-specific arch offers a uniquely supportive feel. The stretchy knit upper adapts to the changing shape of your foot as you run, and responsive cushioning delivers a smooth and energized ride. Energized cushioning Boost is adidas' most responsive cushioning ever: The more energy you give, the more you get Reliable traction Stretchweb outsole flexes naturally for an energized ride, while Continental Rubber gives you superior traction Natural feel and support Aramis 3D motion capture system maps runners' movements to create a fit without pressure points or irritation.