Genuine U.S. Air Force and Navyy issue sunglasses are manufactured under military specification MIL-S-S-25948H. They screen out harmful UV rays. They'll give you distortion free, glare free, prism free vision in true neutral grey color. They're tough too. Impact and scratch resistant, they come in 23-carat gold, matte black or gunmetal with 52 or 58-mm lenses. Carrying case and lens cloth included.