Air 2 is an updated aviator featuring the latest in Revo technology, crafted of 100% titanium and weighs less than 0.5 oz, making it the lightest Revo design ever made. This frame offers our favorite polarized brown-based, light-green mirror coated lens boosted with a light adaptive (photochromic) feature. It changes from semi-transparent to a medium-dark sunglass and back, as quickly as light conditions change.