The long distance runner a durable carbon black mixture a well regarded puncture protection system and the duraskin anti cut fabric turn the gatorskin into a real long distance runner in varying widths of 23mm and 25mm it can be used on the way to work as well as training for road races or for sportives and audax a durable tough tyre at a really nice price hardshell puncture protection and mileage are the strengths of hardshell protection a wider polyx breaker174 the specialist agai