Even Keel. Smooth, steady, and streamlined, Even Keel polarized fashion sunglasses are ready to guide your future journeys. Whether around town or across the country, get ready to experience impressive views with a noteworthy aesthetic. Enchanting nylon and stainless steel frame materials are paired with SuperThin (ST) Glass lenses for optimal clarity. Lens Material: 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.