Cellulose propionate frame, BIOPLASTIC OF PLANT ORIGIN: it is one of the lightest, most flexible and durable materials on the market. ONLY 22 GRAMS TOTAL WEIGHT OF THE GLASSES, LENSES INCLUDED! The ingenious spring mechanism on the temples ensures comfort and adaptability on all faces. Lenses with S3 protection filter, 100% protection from UV rays and glare, available with a multi-layer mirrored effect or matte black polarized anti-glare, for high quality vision. Tortoise or matte black finish. All LIGHT glasses come with a microfiber case for cleaning the lenses and a semi-rigid ETHEN branded shell to protect them from bumps.