Bloc Eyewear X Square Gun Shiny Black Sunglasses (G15 Green Flash Cat 3 Lens) Description: The X Square has the same frame shape as the square but the solid KARBON TXtemples give it more of a classic flavour. An easy wearing style. Conforms to EU Standard BS EN 1836: 2005 + A1:2007 Lens: G15 Green Cat.3 Karbon 8 Optical Class One lens provide MAX UV protection. Distortion free & virtually indestructible. Frame: BLOC frames are hand finished flexible lightweight & designed for comfort fit & performance. The optical class hinges offer both quality & durability. The fully adjustable hypoallergenic nose pads are designed for comfort & fit.