From Maui Jim, the Kiawe PolarizedPlus2® Round 53mm Sunglasses features:  Round shape Lightweight carbon fiber frame Saddle-style keyhole bridge 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. 53mm eye - 20mm bridge - 145mm temple 4-base curve  Two-year warranty Imported.