Maui Jim Akoni Polarized Sunglasses glass lens polarized Saltwater Effectiveness: Lens treatments and frames are saltwater safe. Stainless steel hinges resist corrosion Spring Hinges: Gently hug the head for lasting fit and comfort PolarizedPlus2 Technology: Totally eliminates glare, blocks harmful UV rays and boosts color everywhere SuperThin (ST) Glass Lens: Twenty percent thinner than conventional laminated glass lenses (1.8mm versus 2.2mm). HCL (High Contrast Lens) Bronze (H117-16) offers contrast and is also ideal for low light conditions