The world's first bi focal photochromic sunglasses, featuring high impact UV activated photochromic lenses which transition from clear (Cat0) in low or no light to dark (Cat2) in full sun. The bi focal magnification which is moulded discretely into the rear of the lens is available in +1.50, +2.00 and +2.50 powers. The TR90 super lightweight hybrid frame has dual moulded non slip flexible temples ideal for wearing under open or full face helmets. The adjustable non slip nose piece ensures optimum fit and comfort for all face shapes.