NIKE Women's Free TR Fit 2 Print Training Shoe Blue Glow/Shaded Blue/Night Blue/White Synthetic UPPER: Engineered foam construction. Asymetrical internal structural support system for multi-directional movement. Stretch heel counter for ankle mobility. MIDSOLE: Phylite midsole siped with linear and lateral flex grooves for ultimate multi-directional flexibility and natural motion. OUTSOLE: Heel and forefoot rubber pods for multi-directional traction and control on all surfaces.