Enhance your steps with ULTRA GO cushioning for a responsive and lightweight walking experience. This category is described as a lightweight foam material that allows the foot to transition smoothly from heel to toe throughout the walking gait cycle. It is also designed to be responsive and lessen the impact of foot landing. The ULTRA GO is backed by the ULTRA PILLARS for an enhanced rebound. These protruding knobs are strategically placed at the bottom of the sole creating a bouncy effect.