NIKE Flyknit Trainer Chukka FSB Men Sneakers Black/Volt/White 625009-017 Rubber Knit wool-blend upper for virtually seamless comfort and premium style Flywire cables integrate with the laces for superb lockdown and support Phylon midsole for lightweight cushioning Rubber outsole with Waffle pattern for durability and traction Deep flex grooves for flexibility and natural range of motion