The Nike Air Circuit TR is an indoor fitness shoe designed for the athlete who needs comfort on the machines and responsive cushioning on the gym floor. Double-lasted upper of rich leather overlays for support and strategically placed mesh and breathability. New innovative Air-Sole® unit system provides excellent overall cushioning that feels both soft and stable for a comfortable ride. Phylon™ midsole in the forefoot with internal flex grooves. Non-marking solid rubber outsole with unique micro grip adds great traction on smooth surfaces and the treadmill. Wt. 13.8 oz.