Stability or Cushioning? Cushioning or Stability? With the new Guide ISO 2 , the answer is "yes please". The PWRFOAM midsole and EVERUN topsole combine to give you energetic cushioning while the 2nd density medial post guides the foot through its natural gait cycle. An engineered jacquard, breathable mesh upper, ISOFIT construction, and FORMFIT contoured footbed are just a few ways you'll dial in the custom fit that you've been searching for.