Buried in the vaults of the Smith Optics sunglass archive for decades, the iconic circular frame of the Marvine Polarized Sunglasses has a distinctive round shape and vintage curves. Drawing from all the elements expected of traditional design-simplicity, quality and craftsmanship, the Marvine is an authentic blast from Smith's historic past. Proudly paying homage to generations of free-spirited, creative, and thoughtful intellectuals. Features: Small-Medium Fit/Coverage Carbonic TLT Lenses: Engineered to be the most impact resistant lens material in the world. Injection molded with Tapered Lens Technology (TLT) for optical precision and a high level of protection Crafted using only the finest Cellulose Propionate frame materials with wire-core temples, three-barrel metal hinges 6 Base Lens Curvature: The base curve is the radius of the sphere measured from the back of the lens. Smith features styles with 6, 8, and 9 base lens curvature. Models that include 6 base tend to be more flat relative to your face front. While 9 base styles provide the maximum amount of wrap around your face Lens Info: Polarized Gray Green reduces reflected glare and sharpens detail. The Gray Green lens transmits colors the same way our eyes interpret colors. The result is natural vision - true colors that are easy on the eye. Provides 100% protection from harmful UVA/B/C rays Visible Light Transmission (VLT): The amount of light that reaches the eye after passing through the lens is measured as a percentage. All-purpose sunglasses, for example, typically range in VLT from 15 to 25%, while those designed for scaling a glacier, where the light is blindingly bright, range in VLT from 4 to 10%. Watersport sunglasses typically have a VLT somewhere in between, depending on the particular condition for which they re designed. VLT for this pair sunglasses = 15%