Ngr air carbon reinforced solenorthwaves nrg air carbon reinforced sole provides increased stiffness thanks to the blend of nylon reinforced with fiberglass and enriched with carbon as with the whole road soles collection it features the airflow ventilation system for fresh air circulation in hot weather vents favour an optimal air flow in and out slw 2 closure system maximum precision and usability the side button offers dual functionality press the button for micro metric release or