Bloc Eyewear Hornet Black Sunglasses (SG12 Grey Grad/ Cat 3 Lens) Description: A classic design equally at home on the mountain or on the street. Lens: SG12 GREY GRADUATED CAT.3 Karbon 8 Optical Class One lens provide MAX UV protection. Distortion free & virtually indestructible. Frame BLOC frames utilises tough & compliant KARBON TX Percent core injected frames & are hand finished. They are flexible lightweight & designed for comfort fit & performance. The sports hinge offers both strength & performance.