The Maui Jim Guardrails is part of the MauiFlex memory metal collection. The Guardrails sunglasses are designed for people who demand a durable, comfortable, high performance sunglass. Maui Evolution lenses combine the best properties of glass and polycarbonate in a lightweight crystal clear scratch and impact resistant lens. Perfect for: Driving or lounging on the beach lens treatments and frames are saltwater safe Double bridge, modified aviator frame compliments a range of facial shapes Maui Jim MauiFlex memory metal frame with proprietary material remembers fit and shape longer than traditional metal frames as well as being durable and featherweight. PolarizedPlus2: In every pair of Maui Jims you'll find patented, color infused lens technology that wipes out 99.9% of glare, 100% of harmful UV and boosts color via specially designed lens treatments. So your view is clearer, with crisper contrast and amazing brilliance. Maui Evolution: When you need an everyday lens for your active life, look to the lens that fuses the best properties of SuperThin glass and polycarbonate. Extremely lightweight. Scratch and impact resistant. Patented lens treatments bring the world's true colors to life. With the high performance optics you need to keep up with your outdoor sports. CLEARSHELL Scratch Coating: A proprietary, silicone based hard coat that protects your lenses. Glass is naturally scratch resistant but Maui Evolution and polycarbonate lenses perform better longer with the added durability of Maui Jim's optically correct Clearshell. Applied to front and back of the lens. Maui Jim case and cleaning cloth included.