Bolle’s Shifter Sunglasses come with a large single lens that provides a huge field of vision with stretched peripheral vision. To keep your vision clear the lens comes with an anti-fog lens treatment with integrated vents. The large frame comes with an ergonomic design with curved temples that is best suited to larger face types. A rubber nose pad adds additional stability and helps keeps the glasses in position. Brown Blue Cat 3 Lens Tint Base: Brown Light Transmission: 15% Great for sunny conditions, the brown lenses amplify color contrast and deliver superior visual definition. Meanwhile, the blue hue is great for water-based activities or for when in an environment with a lot of water. The lens also protects your vision with impact-resistance and 100% UV protection.