They work, you'll see.  A study performed by Bjorksten research laboratory division of bit7, inc., demonstrated that while eye black grease works, No Glare® Strips are more effective in reducing glare from bright stadium lights or the sun.  Serious athletes at all levels agree.  No Glare® Strips are more effective than grease, pressure-sensitive so they won't smear or sweat off, easy to use and remove, they won't stain uniforms, and you can towel dry with no greasy mess.  Face it, they work.