From Maui Jim, these Women's Poolside 55mm Polarized Black Square Sunglasses feature: Acetate frame Square shape Saddle-style bridge Traditional pin hinge Size: Medium Square lens Lens Material: SuperThin Glass - SuperThin Glass provides the absolute crispest optics available. 32% thinner and lighter than standard glass, it offers the best scratch resistance MauiGradient® lens Rx able PolarizedPlus2® lenses eliminate 99.9% of glare, block 100% of harmful UV, and absorb harmful HEV while enhancing colors Approx. 55mm lens - 18mm bridge - 140mm temple Imported.