Can SmartCat natural litter really out clump clay litters? yes! with the perfect combination of us farmed grasses, our all natural litter really does the job. Light in weight, but strong in performance it clumps so fast and hard that odors don't even have a chance to escape. You will love how lightweight it is and your kitty's will love that it is all natural with no fragrances. With SmartCat's all natural litter you really do get the best of both worlds.