Fast and Furious, the Fat Boy photochromic sunglasses feature transitional lens technology. The lens transmission allows 87% of light through indoors and 47% of light through while outdoors in bright light. Featuring anti-fog, polycarbonate lenses, this eyewear enables usage through varying light. In addition, closed-cell memory foam around the frame improves comfort and prevents wind or debris from impairing clarity. *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.