From Maui Jim Alulu, these women's sunglasses feature: Cat eye shape Frame: white Tokyo tortoise Lens: neutral grey - offers the highest available light reduction for the richest colors and sharpest contrast Lens material: super thin glass - provides the absolute crispest optics available. 20% to 32% thinner and lighter than standard glass, it offers the best scratch and solvent resistance Rx power range: +3.00 to -5.50 Imported.