We measure sizes by full height. Height range for each fursuit is given in ts description. Head circumference (inside) of our fursuit heads is bigger than head circumference of the user. It allows better ventilation, head can be easily taken off. 

AVERAGE HEAD CIRCUMFERENCES
Kids 8-12       20.2-21 inch or  51.5-53.2 cm
Adult women  21-23  inch  or  53-58 cm
Adult men      22-24  inch  or  56-61 cm

 

How to adjust your fursuit head if it's too big?

Take 1-2 pieces of soft foam, put them into soft fabric case, and fix it with universal glue (for example with Gorilla Glue) 1.5" (4 cm) between eyes of fursuit as shown at the picture. How to adjust your fursuit head if it's too big?