Designed to flex and expand with your foot, the Nike Free TR 8 features a rounded toe box and flex grooves for optimal flexibility while you work out. Durable 3-D printing on a breathable upper equals a winning combination of structure, flex and breathability. Benefits - 3-D print on the upper provides flexibility and breathability. Flywire cables integrate with laces to secure your foot. Flex grooves let your foot bend naturally. Flat heel adds stability. Product Details - Pull tabs at heel and tongue. Foam midsole.