Maui Jim Swinging Bridges Polarized Sunglasses Gunmetal Metal Frame Grey Lens feature a single, elevated brow bar and mixed frame materials of metal and acetate. For anyone desiring a classic aviator with a bit of a twist, Swinging Bridges is a solid choice. They provide the absolute crispest optics available. 20% to 32% thinner and lighter than standard glass, it offers the best scratch and solvent resistance.