NIKE Free Run+ 2 Running Shoes Synthetic Inner sleeve - For a snug fit and to move with the natural motion of the foot as well as t Bonded synthetic overlays - These lightweight and flexible thin strip are attatched to the Fused Phylite Midsole and outsole - This ultra-lightweight material provide an extremely Deep flex grooves - Located along the outsole for natural range of motion and flexibility. "Centre of Pressure" design - Located at heel, this provides additional cushioning on cont