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The Blur Challenge II is built with lightweight performance synthetic for increased speed. The die-cut 4DFoam, UA's proprietary footbed, forms to the foot to give you optimal comfort and reduced cleat pressure. This anti-bacterial footbed increases stability and adds to shock absorption. Finally, the TPU outsole is designed with a bladed heel for immediate ground penetration. Triangular studs in the forefoot will give you quick acceleration in any direction. Non-removable insole.