SPEEDROLL technology effortlessly propels you forward, making you run faster, not harder. The wide PWRRUN cushioned bed provides a comfortable and bouncy ride that's perfect for any day of the week. A stable platform and structural design gently guide your stride, and a new trim heel counter provides a great fit and lighter weight A lightweight mesh upper and improved lacing system provide enhanced breathability and a locked-in fit. FORMFIT hugs the foot with 3D comfort and delivers our best personalized fit yet, and the XT-900 outsole features reinforced high-wear zones for optimal traction and durability.