RunPro High InsolesCURREX RUNPRO High insoles have flexible support with just the right level of rigidity. It's no surprise that experienced runners in a blind study at the German Sport University Cologne chose RUNPRO for comfort. Dynamic Arch Technology engages the muscles of the foot and works in natural synergy with it. It's a flexible arch with the right amount of rigidity which creates extreme sensory stimulation and midfoot guidance on impact. Then, when released,