GutterShutter™ completely encloses and protects your gutters. There are no vertical openings for leaves and debris to enter, and no screens to clog. Rainwater flows over and around the nose of the GutterShutter™ system and into your gutters by the simple law of water surface tension. It's like the way water clings to the side of a glass when poured. The GutterShutter™ system has more surface tension than anyone in our industry.