This eyewear enables usage through varying light The Fat Boy sunglasses feature photochromic lens technology with lens transmission that allows 85% of light through indoors and 32% of light through while outdoors in bright light Closed cell foam around the frame improves comfort and prevents wind or debris from impairing clarity 100% UV protection Anti-fog mirror coated lenses Polycarbonate frame Impact resistant polycarbonate lenses Medium frame size Rx ready Gloss black frame with smoked cyan lenses