Diadora x phantom mtb spd shoes the diadora x phantom mtb shoes feature a fibreglass reinforced nylon sole for effective power transmission and a tpu outsole specially designed for traction and stability features upper suprell tech with morpho cage amsole fibreglass reinforced nylon soleheel cup pre moulded ergonomic tpu heel cup to ensure better heel containmentarch support eva and anti stretch fabricfitting regular plus last provides a perfect fit with higher comfort in the toe boxclo