Size Options S Size: Neck circumference of 9-18 cm, inner diameter of 5 cm, and outer diameter of 22 cm. Suitable for pets weighing less than 3 kg. M Size: Neck circumference of 12-25 cm, inner diameter of 7 cm, and outer diameter of 25 cm. Suitable for pets weighing 3-6 kg. L Size: Neck circumference of 15-31 cm, inner diameter of 10 cm, and outer diameter of 30 cm. Suitable for pets weighing 6-9 kg. XL Size: Neck circumference of 19-36 cm, inner diameter of 12 cm, and outer diameter of 34 cm. Suitable for pets weighing 9-14 kg. Note: Please refer our the 2rd image to carefully measure your pet's head to make sure pets head could go through the cone. Protect Your Cats and Small Dogs- Elizabethan collar is a safe and good method of preventing pet from aggravating a healing wound or injury. The cute sunflower collar will not block your kitten's vision, they can eat, drink, sleep and play normally. Comfortable Material- The Wound Healing Protective Cone is stuffed with cotton, soft and lightweight, ensures pet comfortable wearing experience and won't irritate pets skin. Adorable Costume- Cute Sunflower shape neck cone add more fun and laughter to your cat and your family during its recovery time after Surgery. Great for photo shoots, party times or for Halloween or Christmas day. WARM TIPS- Your pets can still lick their front and back paws with wearing this cone. Only useful for wounds on the upper part their body. Please confirm the position of your lovely pet's wound before placing the order.