Oakley Standard Issue Ballistic M Frame Alpha Sunglasses with Prizm Tr22 Lenses are not just any pair of sunglasses. They were designed specifically for those in the military, law enforcement, and other high-intensity careers. The Ballistic M Frame Alpha meets or exceeds U.S. military ballistic impact requirements, so you can count on them to protect your eyes in the toughest conditions. The Prizm Tr22 Lenses are engineered to enhance color contrast in bright, sunny environments, giving you better vision and preventing eye fatigue. These sunglasses are not only functional, but they also look sleek and professional.