Provide great durability and a barefoot feel. Also comes with a soft yet durable midsole/outsole - Phylon and Fused Phylite Midsole. this Nike Flex 2013 delivers lightweight cushioning and a responsive fit. A super breathable mesh upper keeps air moving while the flexible outsole allows for a natural range of motion. Additonal benefits are its full inner sleeve construction wraps around the entire foot for a snug, comfortable fit and feel. Environmentally preferred rubber and strategically placed segments of solid rubber for enhanced traction and durability in key wear zones.