Directional miniature sipes in the groove walls help defend against the onset of irregular wear and contribute long original tread life (directional to half life). 19/32 of Michelin's latest Advanced Technology compound helps deliver exceptional fuel efficiency and long tread life for more miles. Enhanced shoulder rib is 80% wider than the XZA2 for improved shoulder wear. Wide, flat tread optimizes footprint shape for improved handling and response in line haul service. Directional tread design allows for good traction and long original tread life.