Size S: suitable for cats from 1.5 to 4 kg, neck circumference: 19.5 to 21.6 cm. Size M: suitable for 7-7.5 kg, neck circumference: 22.5-24.5 cm. High quality material: made from durable cotton fabric, it is solid, durable yet flexible which means it is quite comfortable for the cat but still very difficult to get out of. Multifunctional: it is perfect for veterinary visits such as during eye and ear exams, cleaning dental, injections and grooming, nail trimming to prevent your cat from biting you. Very easy to put on and pattern: The cat muzzle comes with an adjustable Velcro strap, which makes very easy assembly. The cat muzzle that covers the eyes has a soothing effect, which is suitable for most situations. And the other cat muzzle that exposes the eyes can be used for eye drops. Warning: You should use this for short periods of time or until your kitten calms down. It is not advisable to keep the mask over your cat’s head for more than 20 minutes as it may affect their breathing.