. Engineered to rigid military specs and issued to millions of US Soldiers, Marines and Airmen since 1958. They feature Color Correct® Grey polycarbonate lenses. Available in frame size 52mm and 55mm. Made in the USA
By measuring the distance between your temples you can gauge your size. Up to 5 inches across choose the 52mm size. Up to 5 ½ inches across choose the 55mm size.