The Gradient is another great photochromic sunglass from Bobster. The frame is dual injected creating a lightweight, flexible frame with rubber on the temples to ensure your eyewear stays in place. The lenses are anti-fog photochromic starting with a light tint (85% transmission) and transform to a medium grey (25% transmission) in bright light. This sunglass is ideal for those looking for something versatile enough to work in almost any light conditions. *Please note that while these glasses would presumably pass ANSI Z87.1-2010 standards, they are NOT certified, and are therefore not endorsed as safety eyewear by Safety Glasses USA.