The Smith Chief Polarchromic Sunglasses command respect, but it's not like they're unapproachable. They're ready to adapt to any situation you may encounter from mountain trails to beachside barbecues. The secret is in these shades' Polarchromic lenses, which boast some of Smith's top technology. They a automatically lighten or darken to respond to the level of light around you, removing glare and UV rays and sparing your retinas from the full force of the sun. The result' You're wearing just the right lens for the day, every time you wear it.