We used data from runners like you to create and place engineered mesh throughout the upper—in areas where it's needed most—for a lightweight and breathable feel. Plus, extra skins placed across the toes add durability. Flywire technology integrates with a midfoot band for total support that helps keep your feet in place. Nike React technology is a lightweight, durable foam that delivers a smooth, responsive ride. The generative traction pattern on the rubber outsole was created using data from runners like you. It provides grip in key areas to help you stay upright and stable when traveling over rocky trails and maintains a smooth ride on the road. Rubber from the outsole wraps up onto the forefoot to help resist abrasion and provide more durability.