There are a couple of factors that limit you out on the trail—don’t let your vision be one of them. Oakley’s Prizm Trail Flak 2.0 XL lenses are optimized to help you easily distinguish obstacles such as rocks, sand, and hard-packed dirt so you always know what’s coming up. They also filter 100% of all UV rays while meeting the highest impact protection standards. The frames use Oakley's lightweight O-Matter material and feature a semi-rimless design for an extensive field of view. The XL designation means they extend peripheral protection against sun, wind, and debris to keep you going at your best. Plus, the ear and nose pieces are made of Oakley's hydrophilic Unobtainium, which improves its grip when wet, so your glasses stay exactly where you want them, even during the most rigorous activities.