From Maui Jim, the Women's Two Steps 55mm Square Sunglasses feature: Nylon frame Nylon temple  Square shape  Saddle bridge  Embedded, glue-on, rubber nose pad Spring hinge  Gender: Female Sizing: Medium  Square lens  Lens Treatment: MauiGradient® Rx able Lens Material: SuperThin Glass Polarized Approx. 55mm lens - 21mm bridge - 139mm temple SuperThin Glass provides the absolute crispest optics available. 32% thinner and lighter than standard glass, it offers the best scratch resistance PolarizedPlus2® lenses eliminate 99.9% of glare, block 100% of harmful UV, and absorb harmful HEV, while enhancing colors Imported.