Sized just right. The refined shape of the Smith Optics Facet Polarized Sunglasses doesn't overstate the unique frame surface transitions. The uniqueness of this frame can be appreciated up close and personal, with thin temples that are complemented by simple, understated branding details. Features: Medium Fit/Medium 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 Evolve Frame Material: An environmentally friendly sunglass frame material that is lightweight and durable Hydrophilic Megol Nose and Temple Pads: Gently grips your skin to help keep your frame in place. The gripping power increases when introduced to moisture 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 Brown Gradient: A Polarized Brown lens that fades gradually from top to bottom of the lens. 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 = 14%