Nrg air carbon reinforced sole nrg air provides increased stiffness thanks to the new blend of nylon reinforced with fiberglass and enriched with carbon as with the whole road soles collection it features the airflow ventilation system vents favour an optimal air flow in and out compatible with spd pedals multilayer thermoweld construction new multilayer construction a light microfiber is coupled with large thermowelded mesh vent inserts at the same thickness of a traditional monolayer th