Head size
The size corresponds to the circumference of the head in centimetres. The head is measured above the ears over the forehead.
52 size from 52-53cm (3-6 years)
54 size from 54-55cm (6-10 years)
Size 56 from 56-57cm
Size 58 from 58-59cm
60 size from 60-61cm
62 size from 62-64cm
64 size from 64-65cm