Please take a measuring tape and place it around the circumference of your head, slightly above the ears, with the tape held fairly closely to your head. Measure your head and then compare the measurement with the table below to find your hat size. If you don’t have tape, then use a piece of string to measure around your head and then check the length using a ruler or other measure. 

The normal head size is 56-59cm ( 7 – 7 3/8 US hat size). The bigger head for hat size XL is 59-62cm ( 7 3/8 – 7 3/4 US hat size).