The Aetrex® X521 Mens Athletic Runner provides unmatched cushioning, shock absorption and motion control to protect and comfort your feet while you run. The unique last and multiple removable insoles enable these shoes to fit many different foot types and make them an ideal choice for those who wear orthotics. The high density external stability enhancer and heel counter provide support and control pronation while the triple density midsole preserves the balance between your body and the ground. The lightweight, removable Aetrex orthotics and Pressure Relief System (PRS) insoles provide optimum comfort and shock attenuation while Running.