From Maui Jim, the Unisex Pehu 55mm Polarized Square Sunglasses feature: Frame: nylon Shape: square Bridge Type: saddle-style Hinge Type: traditional pin Gender and Sizing: unisex, medium Lens Shape: square Lens Treatment: bi-gradient Lens Material: MauiPure®- Maui Jim’s most popular plano lens material. It combines optics almost as crisp as SuperThin Glass with ultra lightweight and excellent scratch and shatter resistance. Polarized: PolarizedPlus2® lenses eliminate 99.9% of glare, block 100% of harmful UV, and absorb harmful HEV, while enhancing colors.  Approx. 55mm lens- 20mm bridge- 136mm temple Imported.