Offering a larger field of view than Bliz's award winning Tracker Sunglasses, the Bliz Tracker Ozon Photochromatic Sunglasses ensure maximum optical clarity when you're skiing fresh powder, ripping down your favorite singletrack, and paddling across open bays. Not only are these sunglasses larger than the traditional Tracker model, but they're also equipped with a photochromatic lens that instantly adapts to changing light conditions. Leveraging Bliz's Ultra Lens Science ULS, the Tracker Ozon not only features a light adapting photochromatic lens, but it's also UV protective, shatterproof, and anti scratch. This means you'll not only maintain visual clarity through quickly changing weather and lighting, but it also makes these shades equipped for accidental drops and mishaps on the trail. The near bombproof Grilamid TR 90 frame ensures long lasting use, even through rigorous outdoor activities. What's cool about this frame is the bottom snaps off, allowing you to change its look and reduce weight when necessary. Two removable Jawbone bottom pieces are included, as are side shields for protecting your eyes during blinding light at high altitudes. Other cool features include a snap in, adjustable snap for added security, as well as a protective case for travel and storage.