Nike Flex Run 2015 running sneaker features lightweight mesh upper for breathability. Breathe Tech construction fuses foam and mesh for ventilation and lightweight support, and bootie construction wraps the foot for a seamless, comfortable feel. Phylon midsole provides pressure mapping for lightweight cushioning, and two-piece Phylite carrier gives a natural feel and reduced bulk. Articulated, full-length flex grooves for smooth, efficient range of motion. Minimal no-sew overlays and molded EVA sockliner for comfort and support, and strategically placed rubber for enhanced durability and traction in high-wear areas.