Double Sided Slit-Foam...Slit-Foam on both sides for easy lure placement & removal. These boxes really do have it all. The strong, clarified ABS plastic is built to last and the positive snap-tight latch ensures the box stays closed. Slit foam is used instead of standard foam to prevent tearing and provide easier fly removal. A rubber watertight gasket seals the box tight, making it extremely water-resistant. Stainless steel hinge pins won’t wear out like traditional plastic hinges.