Fit & Design: Performance sport fishing sunglasses The original look and fit of the trusted Costa Del Mar(R) Blackfin with all the newest Costa PRO Series tech Side shields and hooding help keep light from leaking in and offer maximum coverage Vented and fully-adjustable nose pads offer a customizable fit Sweat channels and eyewire drains help keep your vision clear Metal keeper slots 580G Lightwave Glass lenses provide superior clarity and are scratch-resistant Encapsulated mirrors between layers of glass are scratch-proof 20% thinner and 22% lighter than average polarized glass Technology: Polarized lenses protect against UV rays and filter out unwanted glare New stickier Hydrolite(R) nonslip, hypoallergenic rubber helps keep frames secure Additional Details: Manufacturer Limited Lifetime Warranty