Z87 Blue Blocking Bifocal Sunglasses Safety Rated Polycarbonate Lenses. Impact Resistant ANSI Z87 Saftey Polycarbonate Lenses Indestructible Polycarbonate Frames with MemoryFlex Full 180 degree wrap frames to block wind, dust and debris HD Copper Blue Blocker lens wich provides more clarity and sharper view Integrated rubber ear pieces to prevent slippage