Traditional shape provides optimal coverage with side lenses. Mod-Rectangle shape for medium fit. Square fit fits larger eyeglasses. Sunglasses go on over regular eyeglasses so no need to spend money on a pair of prescription sunglasses. Lenses block 100% of harmful UVA and UVB light. Polarized lenses with scratch resistant PolarTX technology that protects and eliminates harsh glare. Available in black with gray lenses and tortoise with drving (brown) lenses.