Feline Biting Insect Repellent Earth Animal Nature's Protection Flea & Tick Collar for Cats is infused with a natural blend of aromatic herbs & essential oils with a fresh, minty fragrance. The preventative power of these oils are non-offensive to your cat, but repulsive to fleas, ticks, mosquitoes & other biting insects. There are no phthalates, DEET, synthetic chemicals, insecticides, or pesticides and is safe for people, cats, dogs, and the environment. Nature doesn't use synthetic chemicals and neither does Earth Animal. Their philosophy is simple and 40 years strong. They believe that dogs and cats should never be the carriers of synthetic chemical insecticides or pesticides. Earth Animal is dedicated to enhancing and preserving quality of life for animals, people, and the Earth. They do this by providing another way – a more trusted, humane, and sustainable way to change things for the better, one Earth Animal at a time!