Enjoy working out just a little more with help from Nike! Features Nike Free technology specifically designed to let your feet move naturally and freely than traditional athletic shoes. Breathable, engineered mesh upper with lightweight synthetic backing for ventilation and support. Flex grooves in the midsole for flexibility and natural range of motion. The new comfort tongue lays flat on top of the foot and uses layers of sandwich mesh to help reduce lace pressure for a comfortable fit. Environmentally-preferred rubber pods in the heel and forefoot for durability on a variety of surfaces.