They also give you full protection from harmful UV rays

A smaller oval shape

2mm Polycarbonate

Color:Gray Smoke / Prizm Sapphr Iridium PolarizedFrame Size:59-18-137Model:Holbrook XL OO9417Frame Color:Gray SmokeFrame Material:PlasticFrame Shape:SquareFrame Type:Full RimLenses Color:Prizm Sapphr Iridium PolarizedPolarized:Yes

along with color and light transmission standards

N125 ARNETTE HEADLIGHT AN4359 290081 57 BLACK MATTE / SHINY / DARK GREY POLARIZED GREEN GRADIENT MIRRORED LENS They also give you fullFRAME SIZE: 57 18 140 FRAME MATERIALS: INJECTED FRAME SHAPE: RECTANGLE FRAME TYPE: FULL RIM FRAME COLOR: BLACK MATTE SHINY LENSE COLOR: DARK GREY POLARIZED: YES