X10 carbon rubber is positioned in the harder wearing areas of the sole for long lasting durability mile after mile revolutionary parallel wave with the u4ic midsole delivers a truly responsive and resilient ride features u4icx strobel lasting board offers more comfort and cushioning for an enhanced underfoot feeling 3d fit delivers all round comfort and support stretch laces create a dialled in fit parallel wave and u4ic midsole allows for a more resilient responsive ride 12mm heel t