Choose Guide 15 and experience maximum comfort, extreme lightness and a smooth ride. The new version is softer and more responsive and hugs your feet. The new PWRRUN cushioning offers the running sensation you dream of! The HOLLOW-TECH technology, the shaped midsole and the flexibility in the forefoot allow the foot to move freely. The more contoured sockliner wraps the foot in supreme comfort, while the PWRRUN topsole adds a layer of softness.