From Maui Jim, these Women's Violet Lake 53mm Butterfly Sunglasses feature:  Front Material: Titanium with Acetate Rim Temple Material: Titanium with Acetate Tips Bridge Type: Single Nose Pad Type & Material: Adjustable, Ceramic Hinge Type: Traditional pin Gender & Sizing: Female, Medium Lens Shape: Butterfly Lens Material: MauiBrilliant™- MauiBrilliant™ is Maui Jim’s most advanced lens material that features optics nearly as clear as glass with just one-third of the weight Polarized- PolarizedPlus2® lenses eliminate 99.9% of glare, block 100% of harmful UV, and absorb harmful HEV, while enhancing colors. Lens Treatment: MauiGradient® Approx. 53mm lens- 21mm bridge- 140mm temple- 48mm vertical- 4mm plano curvature Imported.