You Otter have this cute Otter hat for winter!! Perfect for any person who loves these adorable creatures. This hat is made to order and can be completely customized. Hat Sizes Measure the circumference of the head going around the forehead and across the back of the head. Do not measure down to the bottom of the head or your size will be a lot bigger. Below are the hat sizes with the circumference of the head size in inches. 0-3 Months - 13-14 inches 3-6 Month - 14-15 inches 6-12 Months - 15-16.5 inches 12-24 Months - 17-18 inches Toddler - 18-19 inches Child - 19-20 inches Adult Small - 21-22 inches Adult Large - 23+ inches