Arm & Hammer Litter Clump & Seal LightWeight Multi-Cat Litter is a lightweight litter that gives you seven days of odor control—guaranteed. It’s 50 percent lighter than Arm & Hammer’s regular litter, but provides the same number of uses in every box, so it’s great for multiple-cat households. This odor-sealing litter uses moisture-activated microgranules to lock in odors and Arm & Hammer baking soda to destroy them on contact. Plant-derived particles help form tight clumps so you can scoop with ease. Clump & Seal LightWeight Multi-Cat Litter is so light and soft that it feels nicer on your kitty’s paws than the average litter.