The engineered mesh upper and durable rubber outsole of the Saucony Carrera XC4 Flat team up for extra rigidity and key ventilation to help power you through your fastest cross-country race yet. Saucony Carrera XC4 Flat features: ISOFIT creates a dynamic fit system by adapting to your foot. Saucony Super Light EVA keeps rebound up and weight down. Rubber outsole is as durable as you are. Wt.: 3.5 oz