Northwave starlight srs womens road shoestotally renewed and wholly improved nrg air sole increases stiffness and reduces weight in addition the starlight has five different areation points for optimal ventilation and comfort featuresultralight unibody uppercarbon reinforced solemultilayer thermowelded featuring thinner and therefore lighter materialsalmost complete stitching eliminationairflow systemslim ratchet system micrometric buckle asymmetrical strapsintegrated heel systemperformance