Head growth of the fetus and infant is largely determined by brain growth. The brain reaches 90% of adult size by 1 year of age; it is 95% of its ultimate adult size by 6 years of age and growth ...

Not every human head conforms to these industry-standard sizes. But that’s not all – what about the fit, the shape of the head, and so on? Fortunately, Shoei, one of the world’s premier ...