See the speckles on the outsole? That means it's made with at least 8% Nike Grind material, made from scraps from the footwear manufacturing process. The upper blends mesh, synthetic leather and textile materials to give you both durability and breathability. Flywire cables integrate with the laces for a secure feel, while the inner sleeve wraps your midfoot for a socklike fit. A rubber outsole with tapered lugs helps you efficiently run up and down hill, while providing the traction you need on rocky roads. A thick material across the toe adds extra durability.