From Maui Jim Alika, these unisex sunglasses feature: Frame: Crystal with Silver Lens: Blue Hawaii - Our blue mirror coating provides a stylish new look that offers the same amazing color enhancement and clarity as all other Maui Jim lenses. Lens Material: Maui Brilliant - Maui Jim’s most advanced lens material that features optics nearly as clear as glass with just one-third of the weight. Rx Power Range: +3.00 to -6.50 Imported.