Pet care professionals choose Guardian Gear Lined Nylon Cat Muzzles to help stop biting and chewing by difficult cats. • Made from strong nylon fabric • Fully adjustable strap and velcro fasteners for an easy fit Easy for owners to use but hard for cats to remove. Sizes: • Medium fits cats 6-12 lbs. • Large fits cats over 12 lbs. IMPORTANT: Use only with direct supervision. Do not leave cat muzzled for long periods of time. Prolonged use of a muzzle inhibits cat's natural cooling system, which can result in a life-threatening situation for the animal. Seller makes no warranty, expressed or implied, when this product is used on cats known to be vicious. Directions for Proper Fit: 1. Place muzzle over the cat's snout. Make sure it fits comfortably. 2. Bring straps behind cat's head and fasten velcro tabs. 3. Adjust velcro so muzzle fits snugly, but not tightly.