NIKE Women's Dual Fusion Run Running Shoe FIREBERRY/WHITE/MATTE SILVER/METALLIC SILVER leather-and-mesh UPPER: Sandwich mesh and leather combined with a dynamic midfoot system provides a superior fit and supportive running experience. MIDSOLE: A dual-density system with a firm Phylon carrier and a soft interior Phylon core that creates a smooth, cushioned ride. OUTSOLE: Waffle outsole pattern design for a smooth heel to toe transition.