Nike Womens Free 1.0 Cross Bionic Running Shoes-Light Ash/Hyper Turquoise-7.5 canvas Synthetic sole Mesh upper and tongue allows your foot to breathe. Flywire cables offers enhanced stability. Features a zero millimeter offset, which means there is no difference between the height of the heel and the forefoot, putting your feet as close to the ground as possible. Modified Nike Free outsole also comes into play, offering even more flexibility with even less weight. Made to enhance your natural movements during all types of training.