Since my daughter has a helmet of the same manufacturer, I was convinced that to can not go wrong. Far from it: I lie with a head circumference of 58cm actually right in the middle of the specified "hat size". But I felt the helmet too big (schlackerte on the head around) and the adjustment expressed in the neck. A helmet should fit easily, otherwise he also does not protect the right place! Property me therefore a Uvex fetched (though unfortunately at twice the price) - but sitting for like 'ne cap!
For people with head circumference 60cm, the helmet could work, however - which is why 2 stars.