World's Best Cat Litterâ„ - is the only litter made from whole-kernel corn. That means it has a naturally microporous structure that keeps nasty odors and smells inside the litter. World's Best Cat Litterâ„ - traps the liquid and limits the wetness from seeping, sinking to the bottom or sticking to the sides of the box. With its patented formula and quick-clumping abilities, it's also is easy to scoop. As a result, one 3.5kg bag of World's Best Cat Litterâ„ - may last one cat more than 30 days. That saves you time and money! World's Best Cat Litterâ„ - isn't made from mined, drilled, or artificially made ingredients. It's milled from renewable whole-kernel corn and is biodegradable, it's also septic-safe and flushable!