TRIATHLON SHOE WITH ADVANCED FIT AND PERFORMANCE TECHNOLOGY. FEATURES Integrated seamless midsole and upper construction set a new level of fit, stability and lightweight performance. Low stack height midsole stabilizes foot and maximizes power transfer efficiency. T1-Quick strap and extra-wide collar simplifies foot entry and quickens transitions. Quickly secure shoe during transitions with easy-to-grab asymmetrical heel loop. 3D breathable mesh improves airflow and dries quicker. Lightweight glass fiber reinforced nylon sole for power transfer. Adaptable cup Insole.