When you wish to be active under highly extreme conditions and a goggle is required, the Wiley X DUAL Technology is a great and effective tool to secure your line of sight. When the lens is cooled down by the colder air from outside the lens and the warmer air hit the lens from the inside, fog will normal appear. The Wiley X DUAL Technology consists of an incorporated thermal bridge between the two layers of the Wiley X DUAL lens, which divides the cold and the warm air from each other and prevents fogging to appear.