Naturally Fresh is made with walnut shells, which provides superior odor control and has greater absorption capacity than the leading brand cat litters. Plus it's all natural and environmentally-friendly. Naturally Fresh Multi-Cat Quick Clumping Litter's super-absorbent formula produces harder clumps than pine, corn and wheat in as little as 15 minutes, making clean-up simple and mess-free. Because it's so absorbent, one bag is equal to three bags of the leading clay litter. Naturally Fresh is virtually dust-free and low tracking so it doesn't stick to your cat's paws and stays in the box.