Have just had one of these delivered for my 2 year old. It is excellent and as good as his brother's Bell one which we paid about £18 for.
He is in the minimum size, but it will do him for another 3 years at least - fits his 4 year old brother
Head size from 45 to 53cm.
Special pad to stop chin getting caught in the buckle
For ages 3 years and over..