Nike Dual Fusion is a lightweight, highly flexible running shoe that gives superior cushioning. Lightweight, minimal upper delivers support only where it's needed. Dynamic lockdown lacing system offers superior fit. Plush linings provide added comfort. Dual-density midsole system consisting of a firmer Phylon carrier and a softer Phylon internal footbed offers the perfect blend of maximum cushioning. Classic Waffle outsole delivers a smooth heel to toe transition without adding unnecessary weight.