NIKE Mens Free Trainer 5.0 Training Shoe Black/Flash Lime Synthetic Natural motion with full-length inner sleeve for maximum fit and comfort. Criss-crossing nanoply bands across the forefoot create a customized fit Dual-density midsole and Nike Free flex grooves for a barefoot training experience. Midfoot wrap-up for additional lateral support Diamond Flex design aid multi-directional movement. Increased traction with delta node grip for superior agility