Nike Unisex Zoom Rival IV Middle Distance Running Spikes Synthetic Open mesh uppers - Lightweight breathable mesh uppers with forefoot overlays for support EVA midsole - Thin EVA wedge for lightweight cushioning to keep your feet comfortable BRS 1000/ Blown rubber outsole - Durable carbon rubber & blown rubber outsole for traction Spikes - 7 removable spikes for great traction on a variety of surfaces.