From Maui Jim, the Hukilau PolarizedPlus2® Round 52mm Sunglasses feature:  Round shape Monel metal frame Single bridge with adjustable, non-slip silicone nose pads Spring hinge SuperThin Glass - Provides the absolute crispest optics available. 20% to 32% thinner and lighter than standard glass, it offers the best scratch and solvent resistance. PolarizedPlus2® lenses eliminate 99.9% of glare, block 100% of harmful UV and absorb harmful HEV Rx able Approx. 52mm eye - 20mm bridge - 145mm temple 4-base curve  Imported.