Since lighter weight equals faster times, then the Mizuno Wave Universe 4 road racing flat might be considered an unfair advantage. AIR Mesh™ upper that provides breathability for the life of the shoe and helps the foot stay cool. Padded collar with fabric lining adds comfort. Printed overlays are located at both the medial and lateral sides to help hold the foot in place. AP midsole delivers lightweight, responsive, yet durable cushioning. Mizuno Wave® technology disperses impact forces uniformly over the length and width of the midsole, providing unrivaled cushioning. It resists overpronation and relieves stress on the ankle and knee joints while minimizing excessive midsole collapse as the foot lands and rolls medially providing superior motion control. SmoothRide™ engineering offers maximum comfort, ultimate feel and unsurpassed performance. G3 rubber outsole provides superior grip with less and added durability in key contact points. Non-removable insole. Wt. 3.8 oz.