NIKE Men's Zoom Structure 18 Flash Cool Grey/Reflect Silver/Black Running Shoe 7.5 Men US Mesh Rubber sole Bonded overlays for added support. Medial adaptive fit system wraps the arch Co-molded, dual-density foam midsole with forefoot Nike Zoom unit Decoupled crash pad for a smooth, supportive ride Environmentally preferred rubber Waffle outsole with BRS 1000 in the heel for durability