Photochromic Lenses (V.L.T. 85-32%) High-Definition Revo Mirror Lenses Anti-Fog Mirror Coated Lenses Fast and Furious, the Fat Boy sunglasses feature photochromic lens technology. The lens transmission allows 85% of light through indoors and 32% of light through while outdoors in bright light. Featuring anti-fog, polycarbonate lenses, this eyewear enables usage through varying light. In addition, closed cell foam around the frame improves comfort and prevents wind or debris from impairing clarity.