Nrc eyewear nrc x series x1 rr sunglassesthe nrc eyewear nrc x series x1 rr sunglasses are inspired by nrcs constant desire for innovation the aim for the rr lens shape is to increase ventilation reduce fogging of the lens protect the eyes from solar radiation and to provide complete vision coverage perfect for competition and training ridesthe carl zeiss one piece lens has been designed using a base colour of gold and brown instead of the common grey base layer this increases the lenses m