This hat is made of acrylic yarn. Hand wash is recommended. ***** Measurements***** I have this hat available in three different sizes: - kittens / small cats / puppies: 8'' head circumference - small / standard cats : 10'' head circumference - large cats / extra small dog breeds: 12'' head circumference ***** Custom Options ***** We happily accept custom orders. If you would like a different size hat or in different color, please feel free to send us a message or use the "Custom Order" button in this listing. ***Owner supervision required at all times***