From Maui Jim, the Unisex Stone Shack 55mm Polarized Square Sunglasses feature: Acetate frame Square shape Saddle-style bridge  Traditional pin hinge Hinge Type: Traditional Pin Gender: Unisex Sizing: Medium  Square lens SuperThin glass lens  Polarized Approx. 55mm lens - 19mm bridge - 144mm 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.