Petio Cat Headwear Perfect for Halloween, this is a wizard-style hat. In image 6, a baseball is included as a size reference. The ball is completely inside the hat, and the front part is wider. The widest part of the cone (inner circumference of the head opening) is approximately 32-33cm (about 12.6-13 inches). Please note that this is a rough measurement, so there may be some error. I bought this, but my cat wouldn't wear it, so I've been storing it. Available for immediate purchase.