Material: cotton + PVC Pier S Circumference: 25cm/9.8"-30cm/11.8" Pier M: 30cm/11.8"-35cm/13.8" Product features 1, using high-quality transparent PVC, the cat can see what you are doing, so there will be no anxiety, nervousness and other emotions 2, made of high-quality cotton, very soft and breathable, so that your cat feels very comfortable after wearing. At the same time, a breathing hole is added in the middle of the cat's mouth, allowing the cat to breathe freely 3. Cat mouth covers can effectively reduce the occurrence of cat fights and avoid injuries. Or, if you have a combative and energetic cat, you can also use this cat with an air mouth to train the cat to stop biting and chewing personal items.