Sweet as can be, Sammy's modish rounded butterfly shape is crafted from eco-friendly handmade bio-acetate paired with Revo's signature NASA-based polarized lens technology for unmatched visual clarity. LENS: Revo high-contrast polarized Serilium+ lenses are lightweight, impact-resistant, glare-reducing nylon. The 6-base lens technology gives a a flatter profile, temple to temple. PROTECTION: Revo Light Management System filters harmful UV, HEV, and Blue Light and Digital Device-friendly by reducing glare and enhancing clarity of digital screens. FRAME: made of handmade bio-acetate which is completely organic, plant-based, sustainable, and 100% biodegradable. SIZE: 55-19-140 mm