All natural and biodegradable, Naturally Fresh is made with walnut shells, an annually renewable non-food agricultural product. Naturally Fresh Ultra Odor Control Litter is enhanced with triple-action enzymes to neutralize fecal, urine and ammonia odors upon contact. It's so absorbent that one bag is equal to 3 bags of the leading clay litter. The hard clumps make cleanup simply and mess-free without having to scrape the box. Naturally Fresh is virtually dust-free and low tracking so it stays in the box and doesn't stick to your cat's paws.