Boost™ midsole Sock-like stretchy upper Stretchy outsole Give your feet a shot of caffeine with adidas Energy Boost Women's Running Shoe. Built with a boost™ midsole, these women's running shoes deliver a smooth, energised ride, absorbing the impact from your footstrike to propel you forward. A sock-like stretchy upper hugs your foot for a seamless, flexible fit, and the heel construction supports a natural stride. Designed in a gridlike pattern, the stretchy outsole adapts to the individual way in which you strike the ground for a smoother transition from heel-strike to toe-off.