Litter Pearls Micro Crystal Cat Litter boasts superior moisture and odor-controlling capabilities due to its sand-like silica gel crystals, which are natural and formed from water, sand, and oxygen. Urine is absorbed in an instant, leaving the litter dry to touch, and odor is managed effectively. In addition, its moisture-evaporating properties are great for the planet; its crystals are reusable for up to two months. With no toxins and a soft, dust-free feel, cats are safe and totally comfortable.