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 omega heel omega heel more ventilation grip and heel protection even with full power downstrokes the rigid profile offers stability combined with an ultralight design performance pro f