Walnut Shell Cat Litter with Essential Oils for a Calming Touch Naturally Fresh Harmony Calming Cat Litter blends the odor control power of walnut shells with a calming lavender and bamboo infusion. This walnut shell cat litter with essential oils offers fast clumping and low tracking while helping create a more peaceful litter box environment. Free from harsh chemicals and artificial fragrances, Naturally Fresh Harmony Calming Cat Litter is gentle on sensitive paws and respiratory systems. This walnut shell cat litter with essential oils is ideal for cats who may benefit from a little extra calm and comfort. Bring balance to their routine with Naturally Fresh Harmony Calming Cat Litter—odor control with a naturally soothing twist.