Energized Cushion. Brooks’ most responsive midsole, DNA AMP, does more than cushioning. Controls, captures and returns energy to help you power your run. Your energy reserves are not limitless. Then our engineers intervened to create a flexible arrow pattern on the outer sole to make movement from heel to toe faster without losing energy. Comfort switches into invisible mode inside the elegant fit knit upper. Hidden features include a heel wrap and an ultra soft heel tab to protect your Achilles heel from irritation. The inner shoe maximizes the comfort of the shoe. The wraparound collar on the heel provides soft comfort to your feet. Suede heel tab protects your Achilles heel from irritation. Breathable mesh upper