This eyewear enables usage through varying lightThe 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 lightClosed cell foam around the frame improves comfort and prevents wind or debris from impairing clarity100% UV protectionAnti-fog mirror coated lensesPolycarbonate frameImpact resistant polycarbonate lensesMedium frame sizeRx readyGloss black frame with clear photochromic lenses