Equipped with a side cupped frame and polarized 580 glass lens, the Costa Del Mar Rooster Polarized 580 Glass Lens Sunglasses specialize at cutting glare off shimmering bays and fast moving streams. Glass provides better optical clarity and scratch resistance than polycarbonate, making these shades ideal for fly fishing and open water activities. And because these sunglasses are equipped with LightWave glass, you'll notice they're much thinner and lighter than standard polarized sunglasses with glass lenses. Blocking 100% of harmful UV radiation, the Polarized 580 glass lens keeps your eyes protected when you're fishing from dawn until dusk. Furthermore, you'll find these sunglasses are exceptional at providing clarity on super bright days, thanks to the Costa 580 technology that blocks visible blue and yellow light from obscuring your vision.