Frame made of cellulose propionate, which is a bio-plastic material of plant origin : it is one of the lightest and flexible material on the market. ONLY 22 GRAMS TOTAL WEIGHT OF THE SUNGLASS, LENS INCLUDED! The ingenious spring mechanism mounted on the chopsticks allows comfort and flexibility on all types of faces. S3 filter lens, protect you 100% from the UV sunbeams and from the balzes. Available with Revo or black mat lens, all lenses are polarised and non-glared for a hugh quality vision. Finishing of the frame is turtle or mat black. All LIGHT sunglasses are sold with a microfiber bag for the lens cleaning and a semi-rigid case to avoid any damages, both marked ETHEN.