From Maui Jim, the Women's Rooftops PolarizedPlus2® 54mm Tortoise Square Sunglasses feature: Square shape Nylon frame SuperThin Glass - Provides the absolute crispest optics available. 20% to 32% thinner and lighter than standard glass, it offers the best scratch and solvent resistance PolarizedPlus2® lenses eliminate 99.9% of glare, block 100% of harmful UV and absorb harmful HEV Rx able  Gradient lens Approx. 54mm eye - 20mm bridge - 145mm temple Imported.