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 asymmetrical strapsthe asymmetrical strap construction is another northwave innovation the central strap is moved to the centre so as to follow