BLOC Shifter D01 Every style has been carefully designed for comfort and fit. An rigorous testing program ensures this product exceeds all global standards including. BLOC glasses are fitted with optical Clarity 1 UV 400 lenses. The unique hue of this lens makes it a true all rounder, equally at home in the brightest conditions, whether on mountain, street or beach. The grey content ensures natural colour transmission, allowing the vermilion to enhance red, green and yellow, whilst eliminating a high degree of blue light. This increases perception of detail and dramatically reduces eye fatigue. Includes the High Definition Lens designed for playing Golf and actually improves your Golf Vision.