High-quality breathable microfiber lining. breathable comfort. feel very soft and delicate. comfortable, breathable.absorbent and strong. anti-bacterial deodorant

• is carefully engineered to naturally expand with your foot while you run to give you a more comfortable fit and help reduce irritation
• boost's energy-returning properties keep every step charged with an endless supply of light, fast energy
• for midfoot integrity; Molded 19-Stripes and heel counter for support and optimum heel hug
• Smooth flowing lines
• rubber outsole is lightweight and elastic, adapting to the ground for stability and working strategically to optimize the unique properties of boost from touchdown to push-off

is carefully engineered to naturally expand with your foot while you run to give you a more comfortable fit and help reduce irritation