Lightweight, breathable, and flexible, the Nike Free Run complements and encourages your natural running stride while keeping feet comfortable all day long. Breathable mesh bootie upper uses Flywire cables to create a secure, locked-down fit. Low-profile midsole and rounded heel encourage a natural footstrike and running gait. New tri-star outsole pattern expands on impact and contracts at toe-off, moving with your stride while providing flexible cushioning and durable traction. Wt. 8.5 oz.