Design: Seamless, bounded upper for minimal pressure points BOA(R) L6 micro-adjustment closure for comfortable, secure fit Weight: 8.9 oz/254 g Reflective heel cup for increased visibility In-Shoe Comfort: X-Comfort Zone for ventilation and expandability to accommodate varying feet widths Ventilated insoles for continuous airflow Durability & Traction: Patented Ergo Air(R) injected nylon and fiberglass outsole for added breathability