These hats are designed to fit adult cats and small dogs. The hat measures about 10" around and has 2" ear holes. -Thanks to the its ear opening our little friends can move easily. -Since it can stretched, it does not tighten. -It is crocheted from 100% Premium Anti-Pilling baby yarn. -It is easy to clean in the machine and by hand. It is long lasting. *These hats will be sent to you with chin straps.