You guys really need to check out the Vaporshield technology of Edge Tactical Eyewear! If you want you can watch this AMAZING *insert sarcasm* youtube video that explains it pretty well... I have been selling quite a few of these and they are awesome! If you are wanting a polarized version, the vaporshield is NOT available as the technologies do not mesh well in the lens manufacturing process.
http://www.youtube.com/watch?v=KDMSmTDB160
http://www.hellscanyonarmory.com/index.php/edge-eyewear/
Mike